Divisibility Rules Worksheet
The trick (Ekadhikena Purvena): 2, 5, 10: the last digit (even; 0 or 5; 0). 3 and 9: add the digits. 4: the last two digits. 8: the last three digits. 6: even and passes the rule for 3. 11: from the right, add the 1st, 3rd, 5th… digits and the 2nd, 4th… digits; the difference must be 0 or a multiple of 11. Any prime p: multiply p by 1, 3, 7 or 9 so it ends in 9; one more than the digits before the 9 is the osculator (7 → 5, 13 → 4, 17 → 12, 19 → 2, 23 → 7, 29 → 3). Take the last digit × the osculator and add it to the rest; repeat until the number is small and check the times table. Composite numbers: split into two factors that share no factor and pass BOTH rules — 6 = 2 × 3, 12 = 3 × 4, 15 = 3 × 5, 18 = 2 × 9, 20 = 4 × 5, 24 = 3 × 8, 30 = 3 × 10.
- 1.Is 130590 divisible by 30?
- 2.Is 153163 divisible by 23?
- 3.Is 34660 divisible by 10?
- 4.Is 90648 divisible by 24?
- 5.Is 40796 divisible by 6?
- 6.Is 38364 divisible by 23?
- 7.Is 20174 divisible by 7?
- 8.Is 17530 divisible by 3?
- 9.Is 112247 divisible by 23?
- 10.Is 120685 divisible by 20?
- 11.Is 19235 divisible by 7?
- 12.Is 10516 divisible by 11?
- 13.Is 45293 divisible by 7?
- 14.Is 8553 divisible by 17?
- 15.Is 74778 divisible by 11?
- 16.Is 1262 divisible by 3?
- 17.Is 11355 divisible by 3?
- 18.Is 39248 divisible by 7?
- 19.Is 8588 divisible by 18?
- 20.Is 12815 divisible by 11?
- 21.Is 48519 divisible by 29?
- 22.Is 82302 divisible by 29?
- 23.Is 81031 divisible by 23?
- 24.Is 125896 divisible by 30?
- 25.Is 71082 divisible by 11?
- 26.Is 8221 divisible by 5?
- 27.Is 8548 divisible by 18?
- 28.Is 20308 divisible by 24?
- 29.Is 3466 divisible by 5?
- 30.Is 33327 divisible by 23?
- 31.Is 31344 divisible by 24?
- 32.Is 26645 divisible by 30?
- 33.Is 202710 divisible by 29?
- 34.Is 5117 divisible by 2?
- 35.Is 88703 divisible by 24?
- 36.Is 19609 divisible by 10?
- 37.Is 94143 divisible by 20?
- 38.Is 83923 divisible by 12?
- 39.Is 20783 divisible by 11?
- 40.Is 101145 divisible by 15?
Answer key
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