Explanation:
Let's solve each multiplication problem step by step. We'll multiply the two numbers in each problem.
1. 55 × 11
Think of it as 55 × (10 + 1) = (55 × 10) + (55 × 1) = 550 + 55 = 605
2. 31 × 42
Break it down: 31 × 40 = 1240, and 31 × 2 = 62.
Add them: 1240 + 62 = 1302
3. 27 × 72
Use the standard method:
27 × 70 = 1890, and 27 × 2 = 54.
Add: 1890 + 54 = 1944
4. 25 × 15
25 × 10 = 250, 25 × 5 = 125.
Add: 250 + 125 = 375
5. 97 × 53
Break it: 97 × 50 = 4850, 97 × 3 = 291.
Add: 4850 + 291 = 5141
6. 38 × 37
38 × 30 = 1140, 38 × 7 = 266.
Add: 1140 + 266 = 1406
7. 74 × 67
74 × 60 = 4440, 74 × 7 = 518.
Add: 4440 + 518 = 4958
8. 99 × 52
99 × 50 = 4950, 99 × 2 = 198.
Add: 4950 + 198 = 5148
9. 10 × 36
This is easy: 10 × 36 = 360
10. 37 × 35
37 × 30 = 1110, 37 × 5 = 185.
Add: 1110 + 185 = 1295
11. 18 × 19
18 × 20 = 360, minus 18 = 342
12. 24 × 53
24 × 50 = 1200, 24 × 3 = 72.
Add: 1200 + 72 = 1272
13. 84 × 84
This is 84 squared.
(80 + 4)² = 80² + 2×80×4 + 4² = 6400 + 640 + 16 = 7056
14. 41 × 25
41 × 100 = 4100, divide by 4 = 1025
Or: 40 × 25 = 1000, 1 × 25 = 25 → 1025
15. 55 × 29
55 × 30 = 1650, minus 55 = 1595
16. 93 × 30
93 × 3 = 279, then ×10 = 2790
17. 20 × 80
2 × 8 = 16, then add two zeros → 1600
18. 25 × 47
25 × 40 = 1000, 25 × 7 = 175.
Add: 1000 + 175 = 1175
Final Answer:
605, 1302, 1944, 375, 5141, 1406, 4958, 5148, 360, 1295, 342, 1272, 7056, 1025, 1595, 2790, 1600, 1175
Parent Tip: Review the logic above to help your child master the concept of 2 digit math worksheet.
