This Grade 2 mental math worksheet builds fluency with number bonds of 10 and making tens within 100. Second graders sort pairs by whether they make ten, then use fill-ins to see how facts like seven plus three power quick sums such as thirty-seven plus three equals forty. True or false questions confirm that knowing bonds of ten helps Grade 2 students finish two-digit addition problems faster in their heads.
Style:
Mental Math Within 100
Part A: Sort the Words
Sort each word or number into the correct category box.
7 + 36 + 45 + 62 + 84 + 51 + 9
Makes 10
Does NOT make 10
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Use a number bond of 10 to finish: 8 + 2 = 10.
2. To add 37 + 3 quickly, notice that 7 + 3 makes 10. The answer is 40.
3. 52 + 8 uses 2 + 8 = 10, so the sum lands on 60.
4. 6 + 4 = 10, the bond of ten partner is the missing number.
5. 74 + 6 equals 80 because 4 + 6 makes 10.
Part C: True or False?
Read each statement. Circle True or False.
1. 7 and 3 are number bond partners because together they make 10.
True False
2. Making tens helps you solve problems like 48 + 2 quickly.
True False
3. 5 and 6 are partners that make 10.
True False
4. Knowing number bonds of 10 has nothing to do with adding two-digit numbers.
True False
Mental Math Within 100
★ Part A: Sort the Words
Sort each word or number into the correct category box.
7 + 36 + 45 + 62 + 84 + 51 + 9
Makes 10
Does NOT make 10
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) Use a number bond of 10 to finish: 8 + 2 = 10.
2) To add 37 + 3 quickly, notice that 7 + 3 makes 10. The answer is 40.
3) 52 + 8 uses 2 + 8 = 10, so the sum lands on 60.
4) 6 + 4 = 10, the bond of ten partner is the missing number.
5) 74 + 6 equals 80 because 4 + 6 makes 10.
★ Part C: True or False?
Read each statement. Circle True or False.
1) 7 and 3 are number bond partners because together they make 10.
True
False
2) Making tens helps you solve problems like 48 + 2 quickly.
True
False
3) 5 and 6 are partners that make 10.
True
False
4) Knowing number bonds of 10 has nothing to do with adding two-digit numbers.
True
False
Ready to Practice?
Complete each section carefully.
10 Questions
15-20 minutes
Auto-graded
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