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
- 1.3 × 99 =
- 2.123 × 9 =
- 3.9 × 99 =
- 4.43 × 999 =
- 5.149 × 999 =
- 6.3 × 9 =
- 7.332 × 999 =
- 8.1052 × 99 =
- 9.5 × 9 =
- 10.83 × 99 =
- 11.2 × 9 =
- 12.52 × 99 =
- 13.551 × 999 =
- 14.27404 × 999 =
- 15.72 × 9 =
- 16.5 × 9 =
- 17.5102 × 999 =
- 18.98 × 99 =
- 19.7 × 9 =
- 20.221 × 999 =
- 21.91 × 99 =
- 22.214 × 999 =
- 23.7 × 9 =
- 24.8 × 9 =
- 25.537 × 999 =
- 26.33 × 99 =
- 27.134 × 9 =
- 28.4 × 9 =
- 29.7 × 9 =
- 30.1992 × 99 =
- 31.6 × 9 =
- 32.61 × 99 =
- 33.137 × 999 =
- 34.18382 × 999 =
- 35.131 × 999 =
- 36.438 × 999 =
- 37.4 × 9 =
- 38.11 × 99 =
- 39.82 × 99 =
- 40.5118 × 999 =
Answer key
- 297
- 1107
- 891
- 42957
- 148851
- 27
- 331668
- 104148
- 45
- 8217
- 18
- 5148
- 550449
- 27376596
- 648
- 45
- 5096898
- 9702
- 63
- 220779
- 9009
- 213786
- 63
- 72
- 536463
- 3267
- 1206
- 36
- 63
- 197208
- 54
- 6039
- 136863
- 18363618
- 130869
- 437562
- 36
- 1089
- 8118
- 5112882
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