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
- 1.75 × 99 =
- 2.12218 × 999 =
- 3.25049 × 999 =
- 4.7 × 9 =
- 5.2 × 9 =
- 6.4 × 9 =
- 7.2 × 9 =
- 8.94 × 9 =
- 9.78 × 9 =
- 10.906 × 999 =
- 11.94 × 99 =
- 12.159 × 9 =
- 13.52 × 9 =
- 14.2 × 9 =
- 15.3 × 9 =
- 16.12531 × 999 =
- 17.19139 × 999 =
- 18.26113 × 999 =
- 19.3465 × 999 =
- 20.2 × 9 =
- 21.768 × 999 =
- 22.66 × 99 =
- 23.27102 × 999 =
- 24.27431 × 999 =
- 25.318 × 999 =
- 26.4 × 9 =
- 27.4 × 99 =
- 28.146 × 999 =
- 29.74 × 99 =
- 30.7 × 9 =
- 31.61 × 99 =
- 32.3 × 9 =
- 33.932 × 999 =
- 34.29 × 99 =
- 35.6 × 9 =
- 36.798 × 999 =
- 37.45 × 99 =
- 38.5 × 9 =
- 39.226 × 9 =
- 40.12581 × 999 =
Answer key
- 7425
- 12205782
- 25023951
- 63
- 18
- 36
- 18
- 846
- 702
- 905094
- 9306
- 1431
- 468
- 18
- 27
- 12518469
- 19119861
- 26086887
- 3461535
- 18
- 767232
- 6534
- 27074898
- 27403569
- 317682
- 36
- 396
- 145854
- 7326
- 63
- 6039
- 27
- 931068
- 2871
- 54
- 797202
- 4455
- 45
- 2034
- 12568419
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