This Grade 2 mental math worksheet focuses on doubles and near-doubles within 100. Second graders use nine fill-in items to find doubles of two-digit numbers and adjust by one for near-doubles like 25 plus 26. A matching section pairs doubles and near-doubles expressions with their correct sums, helping students recognize when a near-double strategy can turn a harder addition into a familiar double fact.
Style:
Mental Math Within 100
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Double 25 means 25 + 25 = 50.
2. Double 30 is 60.
3. A near-double like 25 + 26 equals (25 + 25) + 1 = 51.
4. 24 + 25 uses the double of 24, which is 48, plus 1. The sum is 49.
5. Double 15 is 30.
6. 40 + 41 = double 40 + 1 = 81.
7. Double 35 = 35 + 35 = 70.
8. Near-double 19 + 20 is (double 19) + 1 = 38 + 1 = 39.
9. Double 45 is 90.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Double 20
→ 40
40
Double 22
→ 44
44
23 + 24
→ 47
47
30 + 31
→ 61
61
Mental Math Within 100
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) Double 25 means 25 + 25 = 50.
2) Double 30 is 60.
3) A near-double like 25 + 26 equals (25 + 25) + 1 = 51.
4) 24 + 25 uses the double of 24, which is 48, plus 1. The sum is 49.
5) Double 15 is 30.
6) 40 + 41 = double 40 + 1 = 81.
7) Double 35 = 35 + 35 = 70.
8) Near-double 19 + 20 is (double 19) + 1 = 38 + 1 = 39.
9) Double 45 is 90.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Double 20
→ 40
40
Double 22
→ 44
44
23 + 24
→ 47
47
30 + 31
→ 61
61
Ready to Practice?
Complete each section carefully.
10 Questions
10-15 minutes
Auto-graded
Retry anytime
🏆
Questions Correct
0
Correct
0
Incorrect
0
Skipped
0:00
Time
0%
Score
Review Your Answers
See what you got right, missed, or skipped.