Multiply by 9 and 99 Worksheet
The trick (Ekanyunena Purvena): Write the number with as many digits as there are nines (add zeros in front if needed). Left part: the number minus 1. Right part: “all from 9 and the last from 10” of the number. More digits than the nines (237 × 99)? Split off as many digits as there are nines (2 | 37): left = number − (front part + 1) = 234, right = complement of 37 = 63 → 23463.
NameDateTime takenScore ___ / 40
- 1.68 × 99 =
- 2.2 × 9 =
- 3.96 × 99 =
- 4.7 × 9 =
- 5.13 × 99 =
- 6.21 × 99 =
- 7.13306 × 999 =
- 8.7 × 9 =
- 9.661 × 999 =
- 10.4 × 9 =
- 11.7 × 9 =
- 12.71 × 99 =
- 13.567 × 999 =
- 14.23 × 9 =
- 15.233 × 9 =
- 16.3 × 99 =
- 17.4 × 9 =
- 18.843 × 999 =
- 19.13 × 99 =
- 20.53 × 9 =
- 21.15203 × 999 =
- 22.86 × 99 =
- 23.15267 × 999 =
- 24.2 × 9 =
- 25.205 × 9 =
- 26.1564 × 99 =
- 27.27 × 99 =
- 28.54 × 99 =
- 29.44 × 999 =
- 30.823 × 999 =
- 31.38 × 99 =
- 32.244 × 999 =
- 33.13 × 99 =
- 34.495 × 999 =
- 35.44 × 99 =
- 36.78 × 99 =
- 37.876 × 999 =
- 38.7 × 9 =
- 39.92 × 99 =
- 40.929 × 999 =
Answer key
- 6732
- 18
- 9504
- 63
- 1287
- 2079
- 13292694
- 63
- 660339
- 36
- 63
- 7029
- 566433
- 207
- 2097
- 297
- 36
- 842157
- 1287
- 477
- 15187797
- 8514
- 15251733
- 18
- 1845
- 154836
- 2673
- 5346
- 43956
- 822177
- 3762
- 243756
- 1287
- 494505
- 4356
- 7722
- 875124
- 63
- 9108
- 928071
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