Let’s solve each multiplication problem step by step. We’ll multiply the 3-digit number by the 2-digit number using standard multiplication (also called long multiplication). I’ll show you how to do one or two in detail, then give all the answers at the end.
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Example 1: 435 × 72
Step 1: Multiply 435 by 2 (the ones digit of 72)
→ 435 × 2 = 870
Step 2: Multiply 435 by 70 (the tens digit of 72 — remember, it’s really 7 tens, so we add a zero at the end)
→ 435 × 7 = 3045 → then add a zero → 30450
Step 3: Add the two results
→ 870 + 30450 =
31320
✔ So, 435 × 72 =
31320
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Example 2: 325 × 54
Step 1: 325 × 4 = 1300
Step 2: 325 × 50 = 325 × 5 = 1625 → add zero → 16250
Step 3: 1300 + 16250 =
17550
✔ So, 325 × 54 =
17550
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I’ll now calculate all the rest carefully and list them below. I’ve double-checked each one.
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Row 1:
- 435 × 72 =
31320
- 325 × 54 =
17550
- 804 × 79 = Let’s compute:
→ 804 × 9 = 7236
→ 804 × 70 = 56280
→ 7236 + 56280 =
63516
- 908 × 47 =
→ 908 × 7 = 6356
→ 908 × 40 = 36320
→ 6356 + 36320 =
42676
- 905 × 80 =
→ 905 × 8 = 7240 → add zero →
72400
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Row 2:
- 394 × 71 =
→ 394 × 1 = 394
→ 394 × 70 = 27580
→ 394 + 27580 =
27974
- 977 × 45 =
→ 977 × 5 = 4885
→ 977 × 40 = 39080
→ 4885 + 39080 =
43965
- 256 × 32 =
→ 256 × 2 = 512
→ 256 × 30 = 7680
→ 512 + 7680 =
8192
- 989 × 55 =
→ 989 × 5 = 4945
→ 989 × 50 = 49450
→ 4945 + 49450 =
54395
- 284 × 81 =
→ 284 × 1 = 284
→ 284 × 80 = 22720
→ 284 + 22720 =
23004
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Row 3:
- 183 × 38 =
→ 183 × 8 = 1464
→ 183 × 30 = 5490
→ 1464 + 5490 =
6954
- 592 × 78 =
→ 592 × 8 = 4736
→ 592 × 70 = 41440
→ 4736 + 41440 =
46176
- 501 × 36 =
→ 501 × 6 = 3006
→ 501 × 30 = 15030
→ 3006 + 15030 =
18036
- 428 × 57 =
→ 428 × 7 = 2996
→ 428 × 50 = 21400
→ 2996 + 21400 =
24396
- 640 × 54 =
→ 640 × 4 = 2560
→ 640 × 50 = 32000
→ 2560 + 32000 =
34560
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Row 4:
- 788 × 49 =
→ 788 × 9 = 7092
→ 788 × 40 = 31520
→ 7092 + 31520 =
38612
- 205 × 15 =
→ 205 × 5 = 1025
→ 205 × 10 = 2050
→ 1025 + 2050 =
3075
- 422 × 97 =
→ 422 × 7 = 2954
→ 422 × 90 = 37980
→ 2954 + 37980 =
40934
- 169 × 48 =
→ 169 × 8 = 1352
→ 169 × 40 = 6760
→ 1352 + 6760 =
8112
- 891 × 87 =
→ 891 × 7 = 6237
→ 891 × 80 = 71280
→ 6237 + 71280 =
77517
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Final Answer:
Here are all the correct products:
Row 1:
31320, 17550, 63516, 42676, 72400
Row 2:
27974, 43965, 8192, 54395, 23004
Row 3:
6954, 46176, 18036, 24396, 34560
Row 4:
38612, 3075, 40934, 8112, 77517
Parent Tip: Review the logic above to help your child master the concept of multiplication algorithms worksheet.