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
- 1.63 × 99 =
- 2.473 × 999 =
- 3.1918 × 99 =
- 4.453 × 999 =
- 5.105 × 9 =
- 6.7 × 9 =
- 7.2 × 99 =
- 8.6 × 9 =
- 9.8 × 9 =
- 10.786 × 999 =
- 11.63 × 99 =
- 12.3 × 9 =
- 13.748 × 999 =
- 14.2 × 9 =
- 15.97 × 999 =
- 16.32 × 99 =
- 17.4791 × 999 =
- 18.89 × 99 =
- 19.569 × 999 =
- 20.107 × 9 =
- 21.6 × 9 =
- 22.3 × 9 =
- 23.53 × 99 =
- 24.292 × 999 =
- 25.2766 × 99 =
- 26.22 × 99 =
- 27.37 × 9 =
- 28.17555 × 999 =
- 29.16131 × 999 =
- 30.13735 × 999 =
- 31.8 × 9 =
- 32.291 × 999 =
- 33.5 × 9 =
- 34.7 × 9 =
- 35.2 × 9 =
- 36.6293 × 999 =
- 37.68 × 99 =
- 38.7441 × 999 =
- 39.854 × 999 =
- 40.7 × 99 =
Answer key
- 6237
- 472527
- 189882
- 452547
- 945
- 63
- 198
- 54
- 72
- 785214
- 6237
- 27
- 747252
- 18
- 96903
- 3168
- 4786209
- 8811
- 568431
- 963
- 54
- 27
- 5247
- 291708
- 273834
- 2178
- 333
- 17537445
- 16114869
- 13721265
- 72
- 290709
- 45
- 63
- 18
- 6286707
- 6732
- 7433559
- 853146
- 693
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