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
- 1.81 × 99 =
- 2.6 × 9 =
- 3.7 × 9 =
- 4.6 × 9 =
- 5.251 × 9 =
- 6.4 × 9 =
- 7.5 × 9 =
- 8.24085 × 999 =
- 9.7 × 9 =
- 10.62 × 9 =
- 11.83 × 9 =
- 12.23869 × 999 =
- 13.75 × 99 =
- 14.27041 × 999 =
- 15.151 × 999 =
- 16.21 × 9 =
- 17.493 × 999 =
- 18.831 × 99 =
- 19.3 × 9 =
- 20.101 × 9 =
- 21.6 × 9 =
- 22.987 × 99 =
- 23.8 × 9 =
- 24.1538 × 99 =
- 25.6 × 9 =
- 26.226 × 9 =
- 27.685 × 999 =
- 28.21 × 99 =
- 29.1311 × 99 =
- 30.7 × 99 =
- 31.2534 × 99 =
- 32.81 × 99 =
- 33.2 × 99 =
- 34.81 × 99 =
- 35.2158 × 99 =
- 36.2034 × 99 =
- 37.4 × 9 =
- 38.743 × 999 =
- 39.548 × 999 =
- 40.13 × 9 =
Answer key
- 8019
- 54
- 63
- 54
- 2259
- 36
- 45
- 24060915
- 63
- 558
- 747
- 23845131
- 7425
- 27013959
- 150849
- 189
- 492507
- 82269
- 27
- 909
- 54
- 97713
- 72
- 152262
- 54
- 2034
- 684315
- 2079
- 129789
- 693
- 250866
- 8019
- 198
- 8019
- 213642
- 201366
- 36
- 742257
- 547452
- 117
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