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3 / 40: remainder = 3

13.3333

3.15

3.8

40.2143

8.6

23 / 7 = 3 R 2, 23 < 40, 23 / 4 = 5 R 3

3.3333

3.0769

4.4444

No. Add the digits of the dividend and if that is divisible by 3 then the original number is divisible by 3; if not, its remainder when divided by 3 gives the remainder when the original number is divided by 3: 1 + 2 + 1 = 4 which gives a remainder of 1 when divided by 3, so 121 divided by 3 gives a remainder of 1. (121 = 40 x 3 + 1)

1

It is 286 and remainder 1

10.6897

9.05

7.15

2.3529

40 divided by 6 is 6 with remainder 4.

59

29

58

1

5.7143

10.8696

5.4348