Worked example
What is 24 + 13?
Answer & why
Answer: 37
24 + 13 = 37. Add 10 first, then 3 ones.
Grade 2 · Math
Add and subtract to one hundred
Use tens and ones or a known relationship to add and subtract within one hundred.
8 authored questions + worked example
Add to plan
All questions
All 8 authored questions for this skill.
Question 1
What is 90 − 34?
- 57
- 66
- 56
- 55
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 56
90 − 34 = 56. Subtract 30 first, then 4 ones.
Question 2
What is 63 − 27?
- 36
- 35
- 37
- 46
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 36
63 − 27 = 36. Subtract 20 first, then 7 ones.
Question 3
What is 24 + 13?
- 38
- 37
- 36
- 47
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 37
24 + 13 = 37. Add 10 first, then 3 ones.
Question 4
What is 38 + 7?
- 45
- 44
- 55
- 46
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 45
38 + 7 = 45. Add 0 first, then 7 ones.
Question 5
What is 56 − 20?
- 37
- 36
- 46
- 35
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 36
56 − 20 = 36. Subtract 20 first, then 0 ones.
Question 6
What is 47 + 28?
- 75
- 76
- 74
- 85
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 75
47 + 28 = 75. Add 20 first, then 8 ones.
Question 7
What is 72 − 19?
- 63
- 52
- 53
- 54
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 53
72 − 19 = 53. Subtract 10 first, then 9 ones.
Question 8
What is 36 + 45?
- 80
- 82
- 91
- 81
A hint
Check the operation sign. Use tens and ones to combine or take away.
Answer & why
Answer: 81
36 + 45 = 81. Add 40 first, then 5 ones.