I'll solve each multiplication problem step by step, carefully checking my calculations.
Let me work through all 18 problems:
Problem 1: 38 × 42
- 38 × 40 = 1520
- 38 × 2 = 76
- 1520 + 76 = 1596
Problem 2: 63 × 71
- 63 × 70 = 4410
- 63 × 1 = 63
- 4410 + 63 = 4473
Problem 3: 59 × 13
- 59 × 10 = 590
- 59 × 3 = 177
- 590 + 177 = 767
Problem 4: 98 × 22
- 98 × 20 = 1960
- 98 × 2 = 196
- 1960 + 196 = 2156
Problem 5: 65 × 25
- 65 × 20 = 1300
- 65 × 5 = 325
- 1300 + 325 = 1625
Problem 6: 78 × 98
- 78 × 100 = 7800
- 78 × 2 = 156
- 7800 - 156 = 7644
Problem 7: 79 × 15
- 79 × 10 = 790
- 79 × 5 = 395
- 790 + 395 = 1185
Problem 8: 87 × 35
- 87 × 30 = 2610
- 87 × 5 = 435
- 2610 + 435 = 3045
Problem 9: 41 × 67
- 41 × 60 = 2460
- 41 × 7 = 287
- 2460 + 287 = 2747
Problem 10: 28 × 74
- 28 × 70 = 1960
- 28 × 4 = 112
- 1960 + 112 = 2072
Problem 11: 34 × 38
- 34 × 30 = 1020
- 34 × 8 = 272
- 1020 + 272 = 1292
Problem 12: 54 × 69
- 54 × 70 = 3780
- 54 × 1 = 54
- 3780 - 54 = 3726
Problem 13: 72 × 31
- 72 × 30 = 2160
- 72 × 1 = 72
- 2160 + 72 = 2232
Problem 14: 90 × 19
- 90 × 20 = 1800
- 90 × 1 = 90
- 1800 - 90 = 1710
Problem 15: 42 × 52
- 42 × 50 = 2100
- 42 × 2 = 84
- 2100 + 84 = 2184
Problem 16: 46 × 64
- 46 × 60 = 2760
- 46 × 4 = 184
- 2760 + 184 = 2944
Problem 17: 50 × 99
- 50 × 100 = 5000
- 50 × 1 = 50
- 5000 - 50 = 4950
Problem 18: 63 × 87
- 63 × 80 = 5040
- 63 × 7 = 441
- 5040 + 441 = 5481
Let me verify a few of these calculations to make sure they're correct:
Parent Tip: Review the logic above to help your child master the concept of math worksheet grade 7.