# Identify and explain the subtraction errors.

King Alfred is confused because he is struggling to subtract his accounts.
Below are some of the methods he has used, however he has made several mistakes.

Can you spot the error in his methods?
Explain how he might have made the error.
Solve the calculation (in your books) and share what you did differently.

Key vocabulary:
exchange   place value    column     subtraction
carrying over     because    incorrect

## 15 thoughts on “Identify and explain the subtraction errors.”

1. Demi-Lea Donal

1.Thay put numbers in the wrong coloum

2. Nidhi Parekh

In the first sum when you exchange amount from 7 you should cancel 7 and write 6 on the top of it and then you have to take 5 away from 6 not 60. When you can’t take away 1 from 0, you have to cancel 1 and write 10 on the top of 0.

3. Nidhi Parekh

The correct answer of the first sum
1072-156=916.

The correct answer of the second sum
1432-521=911

The correct answer of the final sum
3721-1562=2159

4. Alisha Riaz

Subtracting sums:

King alfred should of looked at each sum, and start from the right taking each number of the column and carry it over until it can be subtracted. if yes, you stop and can now work out the answer.

5. Eesa Akhalwaya

1.fogot to exchange the hundreds column.
2.king Alfred fogot to exchange the tens and hundreds column.

6. Hamdia Darwish

1.K A forget to exchange for the Hundreds column. So the answer should be 916.
2. K A forgot to exchange for the Tens and Hundreds column. So the answer should be 911.
3. K A forgot to exchange from the Tens and Hundreds . So the answer should be 2159.

7. Kayden-Shai Roberts

1.king Alfred forgot to exchange the thousands colum to the hundreds coloum.
2.king Alfred forgot to put big number first.

8. Safa Khan

1. The mistake was that you should have exchanged the hundreds colemn.
2. The mistake was that he carried over a one and he borrowed a hundred when you can already takeaway three from tow witc is one.
3.The mistake was he carried over two digits.

9. Haleema Asif

1. The answer is 916 and the answer is wrong because the answer is bigger than the 1072 they added your supposed to subtract. Also he didint exchange the thousand but he did get ones and tens coloum right.
2. They got it wrong because if you exchange 1 you cross out the 400 and 1000 they did that right but 13 instead of 400 it should be 1400 instead. So the answer is 911. They got the answer right but not the working out for number 2.

10. Maleeha Memi

I meant maleeha and Safa

11. Louis Sanders

King Alfred got it wrong because he didn’t exchange the the thousand.

12. Elyass Daud

1.King Alfred fogot to exchange.
2.He didn’t need to exchange but he did.

13. Kaiden Dryden

King Alfred forgot to cross the thousands and add 1 to the tens answer/916
King Alfred has carried over so it is wrong answer/911

14. Maleeha Memi

1. He exchanged from 0 when you can’t do that because 0 has no value so you can’t exchange. Also you hd to carry the 1000 to the hundreds because the 0 has nothing to subtract. So he is incorrect.