Dividing and Multiplying by 10 and 100 (T9)

This week you have been using your division and multiplication skills to complete a range of problems.
Today I would like you to provide good explanation and reasoning when answering the problems belo
w.

maths 30.4

Key vocabulary:

place value    smaller     larger     decimal place     divide by
           because        whereas     however           therefore

34 thoughts on “Dividing and Multiplying by 10 and 100 (T9)

  1. 1000diveed by 100 is not 1 you remenber place vaule therefore 1000 didved by 100= 10.

    121 didved by 10 is cprrect wheare as 100 didvd by 100 is incorect.

  2. 1.This question is incorrect because when you divide by 100 you move it 2 spaces to the right However in this calculation they have moved the digits 3 spaces to the right.

  3. The first answer it’s wrong because 100+100 =2000 it isn’t 1 you have to divide 100 not 10 because when you divide by 10 you move your digits to the left. The 2 question is right because 100divided by 456is 45.6

  4. The first question is incorrect because when you divided by 100 you move 2 spaces to the right. And if you divided by 10 you move 1 spaces to the right.

  5. The first question is incorrect because when you divide it by a 100 you move two spaces to the right but the person has moved 3 spaces to the right and The answer
    Should have been 10
    2)The answer is incorrect because when dividing by 10 you only move one space
    To the right not 2 spaces E.g 400 divided by 100 is 4

  6. The first question is incorrect because 1000 divided by 100 is not 1 because when you divide by 100 you all ways move 2 spaces to the right, but this calculation had moved 3 spaces to the right.the correct answer should of been 10.

    The second question is incorrect because If you would be dividing by 100 the answer would be 4.56 but the calculations answer is 45.6.it would be 45.6 if you was dividing by 10.

    Number three is incorrect because of you was dividing by 100 the answer would
    Be 4.73 but the calculation is divided by 10 so the real calculation would of been 47.3.

  7. The first question is incorrect because when you divide by 100 you move 2 space to the right but they moved it 3 spaces instead of 2 the correct answer should have been 10

    This answer is incorrect because the person who answered this question has wrote the wrong answer because he didn’t times the question. The person who did this question can correct this question by moving each number 2 place values. For a example you times 15.60 by 100 rather than nothing. Therefore if you times 43.23 by 100 the answer is 4323

    This answer is incorrect because, when you multiply by 100 you move two spaces to the left rather than one space to the left therefore the answer is 4323.

  8. 1)
    This is incorrect because you divided by 100 so you mobe 2 spaces to the right but you moved 3 spaces to the right the actual answer is 10.
    2)
    The second one is incorrect because you divided 10 but you had to divide 100 so the answer is 4.56.
    3)
    This is incorrect because you / by 100 when you had to/ by 10

  9. 1)
    The first one is incorrect because when you divide by 100 you move 2 spaces to the right however in this calculation the dights has moved 3 spaces to the right. Answer is :10
    2) the 2 one is wrong becuse you divide by 10you move one space to the right rather than two spaces.
    3) the answer is incorrect becuse ,when you divide by ten you move ONE space to the right becuse you just move the dights along .5)
    The answer is incorrect becuse you move tow spaces,to the right so you move only one time

  10. 1. 1000/ 100= 1 this is incorrect because it should be two spaces to the right and the answer should be 10.

    2. 456/ 100= 45.6 this is incorrect because it should two spaces to the right and the answer should be 4.56.

    3. 473/ 10 = 4.73 this is is incorrect because it should be two spaces to the right and answer should be 47.3.
    4. 121/ 10= 12.1 this is correct.

  11. The first questions is incorrect because when you dined by a 100 you move 2 spaces to the right but the questions has moved 3 spaces the right . the answer stud have been 1100 .

  12. 1000 divide 100=1
    This answer is incorrect because,when you divide by 100 you only move each digit two place to the right rather than one place to the right.
    E.g 5465 becomes 54.65 when divided by 100.
    Therefore if you divide 1000 by 100 the answer should be 10.

    43.23 x100=43.23
    The answer is incorrect because,you move two place to the left rather then moving one place to the left.Therefore the answer should be 4.323

    456 divide 100=45.6
    This is incorrect because,when you divide by 100 you move two place to the right and when you divide by 10 you move one place to the right.
    Therefore if you divide 456 by 100 so the answer is 4.56.

  13. 1.1000 divide 100 = 1
    This answer incorrect because when you divide by 100 you move two places
    to the right e.g 5000 becomes 50 when you divide by 100, therefore the answer is going to be 10.
    2.43.23 times by 100 = 43.23
    This is incorrect because you would need to use your place value so one place to the left rather than to the right.
    3.473 divide by 10 = 4.73
    You need to move one place to the right so the answer is 47.3
    4.02 x 10 = 40
    The answer is incorrect so the answer is 4020.

  14. 1.This question is incorrect because the person who did this has dived this by 1000 however the question asks you to divide 1000 by 100 rather than 1000.For a example you divided 5000 by 100 it makes 50 .Therefore if you divide 1000 by 100 the answer is 10.
    2.This answer is incorrect because the person who answered this question has wrote the wrong answer because he didn’t times the question. The person who did this question can correct this question by moving each number 2 place values. For a example you times 15.60 by 100 rather than nothing. Therefore if you times 43.23 by 100 the answer is 4323.
    3.This answer is correct because the person who wrote the question and answered it correctly.
    4.This answer is incorrect because when you divide by 10 you only move each digit ONE place to right rather than two places. A example is that 400 becomes 40 epwhen you divide it by 10. Therefore if you divide 473 by the answer should be 47.3.

  15. 1. This is false because it moved three places but it must move 2 places because the decimal point divide by 100.E.G 2000 divide by 100 is 20. I moved 2 places to the right so the answer is 10.

    2.This is false because the answer can’t be the same it must always movie like 76.54 it will move and the answer is 7654 also I divide by 100.This is the answer for the question is 4323

  16. 1.This answer is incorrect because, when you divide by 100 you move two spaces to the right rather than three spaces to the right so the answer is 10.

    2. This answer is incorrect because, when you divide by 100 you move two spaces to the right rather than one space to the right therefore the answer is 4.56.

    3.This answer is incorrect because, when you multiply by 100 you move two spaces to the left rather than one space to the left therefore the answer is 4323.

    4.This answer is incorrect because, when you divide by 10 you only move each digit one place to the right rather than two places to the right therefore the answer is 47.3.

  17. 1. The answer is incorrect because if you divide by ten you alone move one space to the right rather than two spaces. Therefore the answer is ten. E.g.400 divided by ten is 40.
    2. The answer is incorrect because if you multiply by hundred you anyone move two spaces to the left rather than one space. Therefore the answer is 4,323. E.g. 45.55 multiply by hundred is 4,555.
    3. This answer is correct because if you divide by hundered you move alone one space to the right rather than two space. Therefore the answer is 45.6.
    4. The answer is correct because if you multiply by Hunndered you move two spaces to the left rather than one.therefore the answer is 24.32.

  18. 1.This answer is incorrect because dividing by 100 means you have to move the digits TWO places to the right not three e.g 4000 divide 100 = 40. So the answer is 10.
    2. This answer is incorrect because dividing by 100 means the digits move TWO spaces to the right not one e.g 450 divide 100=4.5. So the answer must be 4.73.

    3. This answer is correct because 121 divide 10=12.1 because when dividing by 10 you must move the digits one place to the right.

    4. This answer is incorrect because the digits should have moved two places to the left not none e.g 40×100=4000. So the answer must be 4323.

  19. 1.The answer is incorrect because If you divide 100 you should move 2 spaces to the right. If you divide by 10 you should move 1 space to the right.
    E.G. 1000 divide by 1oo = 10 because I moved 2 space to the write.
    2.The answer is incorrect because the person has not moved 2 spaces to the right instead he has moved to 1 space to the right.
    3 . The first multiplication sum wrong because they have moved 1 space . They
    Should of moved 2 space
    4.The division is wrong because they moved 1 space to right.
    E.g move 2 spaces.
    4.

  20. 1 The first one is incorrect because if your dividing by 100 you move two places to the right so the answer would be 10.E.G 4000 divided by 100 = 40.

    2 The first multiplication one is correct because if you multiply by 100 you move two places to the left.E.G 62.23 x 100 = 62.23
    3 This one is incorrect because the sum is dividing by 100 and this ones divided by 10 rather than 100.E.G 653 divided by 100 = 6.53
    4 This one is incorrect because if your dividing by 100 it would have equaled 243.2

  21. 1.100 divided by 1000=10
    The answer is 10 because the 1000 is moved two spaces to the right.
    2.43.23×100=43.230
    3.2.432×100=43.2
    4.473 divided by 100=4.7

  22. 1)This answer is incorrect because, when dividing by 10 you move ONE space to the right. E.g 2000 divided by 100 is 20. There fore the answer should be 10
    2) The answer is incorrect because, when dividing by 10 you only move one place to the right rather than 2 places. E.g 400 divided by 100 is 4. Therefore 456 dived by 100 is 4.56
    3) This answer is incorrect because, when dividing by 10 you only move ONE place to the right rather than 2 places. E.g 400 becomes 40 when dividing by 10. Therefore if you divide by 473 by 10 the answer should be 47.3
    4) The answer is incorrect because, multiplying by 100 you move 2 places to the left rather than moving 0 places .E.g 10 times 100 is 1000. Therefore your answer should be 4.323.

  23. The first calculation is incorrect because,when you divide by 100 you only move 2 spaces to the right on the other hand in this calculation the digits have moved 3 spaces to the right .

    The second question is correct because the digits have moved 2 spaces to the right. E.g 632 divide by 100= 63.2

    The third calculation is incorrect because the digits have moved 2 spaces to the left. When you times by 10 you move 1 space to the left.

    The fourth question is incorrect because the digits have moved 2 spaces rather than 1 space .

  24. 1. The first calculation is incorrect because, when you divide by 100 you only move two spaces to the right. However, in this calculation the digits have moved 3 digits to the right.

    2. The second calculation is correct because the digits have moved to places to the right. E.g. 782 divide by 100= 78.2.

    3.The third calculation is incorrect because the digits have moved two places to the right. E.g. 325 x 10=32.5

    4. The fourth calculation is incorrect because the digits have moved 2 places to the right rather than 1 place to the right.

  25. The 1st question is incorrect because when you divide by a 100 you move 2 spaces to the right however in this calculation the digits has moved 3 spaces to the right.The second question is correct because the digits have moved 2 spaces to the right e.g 456 divided by 100 =45.5
    3. The 3rd calculation is incorrect because the digits have moved 1 space to the left e.g 452 x 10= 45.2
    4. The 4th calculation is incorrect because the digits are moving 2 spaces to the right rather than 1 space to the right.

    • 1st sums are incorrect because when 100 are divide you need to move 2 spaces to the right but the second question is correct because they moved 3 spaces to the tight.
      2nd e.g 456÷100=45.5
      3rd the next questions is incorrect because the digit are moving 2 space to the left e.g 452×10=45.2
      4th the next question is in correct because the digit are moving 2 spaces to the right or than 1 space to the tight

Leave a Reply