1

3

1

2

599

1

3

12

1

4

7

1

5

8

1

6

596

1

7

0

1

8

91

1

9

55

1

10

428

1

11

20

1

Look for the children seeing the connection between
the numbers and as 46 is 10 more than 36 they
know the missing number must be 10 less than 30 to
make the number sentences balance.

12

402

1

Have children calculated the subtraction mentally or
used column method?

13

102

1

Look for children finding the number bonds to 100
and then adding 2 afterwards. Have they calculated it
mentally?

14

7

1

15

642

1

16

483

1

17

472

1

18

100

1

Look for children writing 10 as they do not
understand how to balance both sides of the equal
sign.

19

74

2

Award 1 mark for one step of calculation correct.
e.g. 512 + 394 = 906 or if that is incorrect award 1
mark for correct subtraction followed through.