Addition
2 + 5
7
4 - 1
3 x 2
8 / 2
A student says: 9 x 5 = 40
What did they do wrong?
9 x 5 = 45
10 x 4 = 40
14 + 8
22
35 - 10
12 x 3
24 / 2
12
A student says: 100 - 38 = 72
What did they do wrong?
100 - 38 = 62
They didn't regroup properly
104 + 238
342
250 - 150 - 6
94
10 x 15
150
140 / 20
7
A student says 8 x 7 = 46
What did they do wrong?
8 x 7 = 56
They multiplied incorrectly
234 + 998 + 23
1,255
384 - 238
146
37 x 12
444
98 / 7
14
A student solves: 46 + 37 = 713
What did they do wrong?
46 + 37 = 83
They didn't regroup properly
71 + 34 + 22 + 17 + 12 + 9
165
73 - 42 - 5
26
42 x 17 x 18
108 / 12
9
A student says 102 = 20.
What did they do wrong?
102 = 10 x 10 = 100