Second graders explore mental math addition patterns within 100 in this Grade 2 worksheet. Nine fill-in items reveal how adding the same tens to numbers with the same ones digit creates predictable sums, such as 25 plus 40 and 35 plus 40. A matching section pairs problems that add 30 to numbers ending in 2 with their sums, helping Grade 2 students use patterns to calculate sums rapidly in their heads.
Style:
Mental Math Within 100
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 25 + 40 = 65 using the pattern of adding four tens.
2. 35 + 40 = 75 by jumping four tens from 35.
3. 45 + 40 = 85 continuing the same pattern.
4. The ones digit stays the same in these patterns. It is always 5.
5. 16 + 20 = 36 by adding two tens.
6. 26 + 20 = 46 by the same pattern as 16 + 20.
7. 36 + 20 = 56 continuing the pattern.
8. 50 + 30 = 80 follows a pattern of pure tens.
9. 60 + 30 = 90 continues the pure tens pattern.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
22 + 30
→ 52
52
32 + 30
→ 62
62
42 + 30
→ 72
72
52 + 30
→ 82
82
Mental Math Within 100
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) 25 + 40 = 65 using the pattern of adding four tens.
2) 35 + 40 = 75 by jumping four tens from 35.
3) 45 + 40 = 85 continuing the same pattern.
4) The ones digit stays the same in these patterns. It is always 5.
5) 16 + 20 = 36 by adding two tens.
6) 26 + 20 = 46 by the same pattern as 16 + 20.
7) 36 + 20 = 56 continuing the pattern.
8) 50 + 30 = 80 follows a pattern of pure tens.
9) 60 + 30 = 90 continues the pure tens pattern.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
22 + 30
→ 52
52
32 + 30
→ 62
62
42 + 30
→ 72
72
52 + 30
→ 82
82
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
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