About this preparation
Math diagnostic test, Grade 2: Subtraction. 10 questions with answers and explanations. Topics: Subtraction within 100, Subtracting with regrouping, Word problems on subtraction, Missing number subtraction. Duration: 55 min.
Diagnostic tasks
Below is the full list of tasks with correct answers and explanations. In a lesson the tutor can hide the answers and reveal them after the student tries.
1
What is 47 - 15?
22
32
42
52
Explanation: Subtract 10 from 47 to get 37, then subtract 5 more to get 32.
2
What is 63 - 28?
35
45
53
41
Explanation: Regroup 63 as 5 tens and 13 ones. Then 13 - 8 = 5 and 5 tens - 2 tens = 3 tens, so the answer is 35.
3
What is 90 - 36?
44
54
64
56
Explanation: Subtract 30 from 90 to get 60, then subtract 6 more to get 54.
4
What is 58 - 19?
39
49
29
41
Explanation: Regroup 58 as 4 tens and 18 ones. Then 18 - 9 = 9 and 4 tens - 1 ten = 3 tens, so the answer is 39.
5
What is 72 - 8?
54
64
62
66
Explanation: Take 8 away from 72: 72 - 2 = 70, then 70 - 6 = 64.
6
What is 81 - 47?
44
34
24
36
Explanation: Regroup 81 as 7 tens and 11 ones. Then 11 - 7 = 4 and 7 tens - 4 tens = 3 tens, so the answer is 34.
7
What is 100 - 25?
85
75
65
80
Explanation: Subtract 20 from 100 to get 80, then subtract 5 more to get 75.
8
What is 66 - 39?
37
27
17
29
Explanation: Regroup 66 as 5 tens and 16 ones. Then 16 - 9 = 7 and 5 tens - 3 tens = 2 tens, so the answer is 27.
9
A box has 54 crayons. 21 crayons are taken out. How many crayons are left?
33
23
43
31
Explanation: This is 54 - 21. Subtract 20 to get 34, then subtract 1 more to get 33.
10
What number makes the equation true? 70 - ___ = 46
14
24
26
34
Explanation: Find the missing number by subtracting 46 from 70: 70 - 46 = 24.
