Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 830 · 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 264 + 778 = 1036 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 86 × 29 = 2489 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 85 × 41 = 3485 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 96 × 21 = 2016 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 739 + 616 = 1355 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 783 + 821 = 1604 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 61 × 72 = 4384 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 95 × 92 = 8740 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 86 × 40 = 3440 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 328 + 916 = 1244 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 692 + 530 = 1222 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 576 + 940 = 1509 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 961 + 475 = 1436 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 129 + 291 = 420 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 618 + 294 = 912 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 85 × 42 = 3570 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 94 × 38 = 3575 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 268 + 114 = 391 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 610 + 904 = 1514 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 827 + 818 = 1645 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 32 × 79 = 2528 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 796 + 294 = 1090 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 767 + 296 = 1063 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 62 × 38 = 2356 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 88 × 17 = 1496 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 920 + 380 = 1305 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 74 = 4667 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 38 × 70 = 2668 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 52 × 47 = 2444 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 65 × 59 = 3835 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 96 × 52 = 4999 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 35 × 80 = 2793 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 74 × 21 = 1554 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 59 × 62 = 3658 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 198 + 422 = 620 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 375 + 610 = 992 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 957 + 324 = 1281 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 74 × 50 = 3700 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 28 × 36 = 1001 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 34 × 26 = 883 right or wrong? (a) Wrong (b) Right

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