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Maths tricks trick 22: Last-digit detective · Set 525 · 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 903 + 785 = 1688 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 888 + 235 = 1123 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 597 + 295 = 886 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 67 × 23 = 1541 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 58 × 20 = 1160 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 98 × 77 = 7546 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 20 × 46 = 920 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 16 × 68 = 1088 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 72 = 5400 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 324 + 349 = 673 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 60 = 1736 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 558 + 356 = 914 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 153 + 904 = 1054 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 62 × 29 = 1798 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 56 × 14 = 784 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 49 × 82 = 4018 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 612 + 942 = 1554 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 202 + 778 = 977 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 55 = 5119 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 139 + 864 = 1003 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 999 + 897 = 1891 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 171 + 758 = 928 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 49 × 76 = 3733 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 69 × 34 = 2350 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 957 + 415 = 1372 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 28 × 32 = 888 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 53 × 31 = 1643 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 767 + 593 = 1360 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 63 × 69 = 4345 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 45 × 38 = 1710 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 58 × 24 = 1393 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 97 × 98 = 9512 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 48 × 87 = 4176 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 14 × 53 = 742 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 322 + 921 = 1245 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 25 × 25 = 631 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 45 × 95 = 4275 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 678 + 151 = 822 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 858 + 860 = 1727 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 76 × 26 = 1976 right or wrong? (a) Wrong (b) Right

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