Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 920 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 13 × 36 = 468 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 32 × 16 = 511 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 616 + 397 = 1015 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 297 + 690 = 987 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 24 = 1231 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 219 + 230 = 449 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 89 × 62 = 5518 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 67 × 16 = 1072 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 62 × 71 = 4402 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 56 × 62 = 3478 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 70 × 47 = 3290 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 533 + 739 = 1265 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 717 + 980 = 1694 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 728 + 754 = 1482 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 928 + 908 = 1836 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 345 + 122 = 466 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 522 + 374 = 896 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 64 × 75 = 4800 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 712 + 153 = 865 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 163 + 320 = 483 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 42 × 77 = 3236 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 26 × 93 = 2416 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 49 = 1813 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 89 × 77 = 6853 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 71 × 19 = 1349 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 21 × 37 = 784 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 123 + 174 = 297 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 163 + 518 = 681 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 14 × 28 = 392 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 804 + 145 = 949 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 37 × 76 = 2810 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 846 + 506 = 1352 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 88 × 57 = 5016 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 797 + 246 = 1043 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 12 × 89 = 1068 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 51 × 55 = 2805 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 63 × 24 = 1514 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 541 + 870 = 1418 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 19 × 44 = 838 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 746 + 108 = 855 right or wrong? (a) Wrong (b) Right

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