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# Long multiplication revision

Consolidate your learning from today’s lesson by giving these a go:

1. 22 x 12=

2. 31 x 11=

3. 32 x 21=

4. 22 x 13=

5. 30 x 22=

6. 13 x 24 =

Challenge: Every day, a bakery makes 67 cookies. How many cookies will they make in the month of October?

#### 4 responses to “Long multiplication revision”

1. Nma M.

1. The answer to 22 x 12= 264
2. The answer to 31 x 11 = 310
3. The answer to 32 x 21 =672
4. The answer to 22 x 13 = 286
5. The answer to 30 x 22 = 360
6. The answer to 13 x 24 = 286
Challenge:
If there is 67 cookies in a bakery and it’s October from January you would have to do 67+67 10 times because this means January to October, add or times, but the add answer 67 10 times the answer would be 670. I am stuck between thinking it would be February as well to October, because your sometimes not supposed to do January from December if your on January, you would normally do February to December. But if you times 67 10 times it would be 670 because I have proof and my proof is that I did 67 x 10 = 670 because in the columns you could for example do:
If I know that 10 x 3 = 30, that means 30 x 10 = 300, so that means it would add a 0 at the end, and this is another example:
If I had a question that was 9 x 10 = 90, so that also means 90 x 10 automatically = 900.

My other proving for the adding that I have explained about that was you would need to do 67+67 10 times is because:
If I did 67+67=134, but if i x’s it – 67 x 67 I would get a different higher number because x’sing is more. So my point is that how I got the number 670 is because I did 67 x 10 = 670, and I also did 67+67 10 times and they would both equal the same. This is because if you add it by 10 times and times it by 10 they are both the same multiplication on 10 – so that’s why I got the same answer.

2. Yahya K.

22×12=264
31×11=341
32×21=672
22×13=286
30×22=660
13×24=312
CHALLENGE
31×67=2077
They will make 2077 cookies in October.

3. Janelle O.

22 x 12 = 264
31 × 11 = 341
32 × 21 = 672
22 × 13 = 286
30 × 22 = 660
13× 24 = 312

4. Amelia A.

22×12=264
31×11=341
32×21=672
22×13=286
30×22=660
13×24=312