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
- 1.11 × 99 =
- 2.49 × 99 =
- 3.5 × 999 =
- 4.16123 × 999 =
- 5.11 × 99 =
- 6.427 × 999 =
- 7.74 × 99 =
- 8.256 × 9 =
- 9.188 × 999 =
- 10.131 × 999 =
- 11.9 × 99 =
- 12.29149 × 999 =
- 13.58 × 99 =
- 14.48 × 9 =
- 15.183 × 999 =
- 16.4 × 9 =
- 17.98 × 99 =
- 18.5 × 9 =
- 19.209 × 9 =
- 20.8 × 9 =
- 21.21 × 999 =
- 22.27123 × 999 =
- 23.2 × 9 =
- 24.974 × 999 =
- 25.45 × 99 =
- 26.8 × 9 =
- 27.6 × 99 =
- 28.39 × 99 =
- 29.637 × 999 =
- 30.45 × 999 =
- 31.169 × 99 =
- 32.3 × 99 =
- 33.2 × 9 =
- 34.61 × 99 =
- 35.2 × 9 =
- 36.31 × 99 =
- 37.901 × 999 =
- 38.262 × 999 =
- 39.9911 × 999 =
- 40.3 × 9 =
Answer key
- 1089
- 4851
- 4995
- 16106877
- 1089
- 426573
- 7326
- 2304
- 187812
- 130869
- 891
- 29119851
- 5742
- 432
- 182817
- 36
- 9702
- 45
- 1881
- 72
- 20979
- 27095877
- 18
- 973026
- 4455
- 72
- 594
- 3861
- 636363
- 44955
- 16731
- 297
- 18
- 6039
- 18
- 3069
- 900099
- 261738
- 9901089
- 27
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