1840 / 1 = 1840
1840 / 2 = 920
1840 / 4 = 460
1840 / 5 = 368
1840 / 8 = 230
1840 / 10 = 184
1840 / 16 = 115
1840 / 20 = 92
1840 / 23 = 80
1840 / 40 = 46
1840 is a multiple of 1, 2, 4, 5, 8, 10, 16, 20, 23, 40, 46, 80, 92, 115, 184, 230, 368, 460, 920 and itself
A number is a multiple of 1840 if it's a multiple of 23 and 80 at the same time. It also works if it's a multiple of 5 and 368, 16 and 115 or 5, 16 and 23
1840 = 2⁴ x 5 x 23 = 16 x 5 x 23 = 80 x 23
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If the last 4 digits are divisible by 80, the entire number is divisible by 80.But really, it is hardly worth-while to learn divisibility rules for a large amount of numbers; only for a few small numbers. Normally it is easier to just do the division.
Its really easy all you have to do is divide without leaving a remainder
You use divisibility rules t determine whether a particular number is (or is not) a factor of another number. If it is a factor, you can reduce the numbers involved to smaller numbers.You might want to find factors to simplify fractions or to add or subtract factions.
For any practical purpose, it is easier to simply divide, instead of looking for fancy divisibility rules. However, you can apply the divisibility rules for 3 and for 7. This works because (a) their product is 21, and (b) these numbers are relatively prime.
Factors of numbers are divisible by them with no remainders