Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 215 · 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 211 + 290 = 493 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 69 × 99 = 6831 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 76 × 35 = 2660 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 76 × 84 = 6384 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 112 + 892 = 1004 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 59 × 56 = 3304 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 68 × 49 = 3327 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 67 × 99 = 6630 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 193 + 822 = 1015 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 15 × 64 = 966 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 90 × 51 = 4590 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 521 + 280 = 806 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 137 + 943 = 1083 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 456 + 377 = 826 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 42 × 75 = 3154 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 19 × 32 = 612 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 39 = 1872 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 315 + 859 = 1174 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 34 × 79 = 2687 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 799 + 804 = 1596 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 23 × 98 = 2254 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 781 + 956 = 1737 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 684 + 832 = 1516 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 33 × 68 = 2244 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 335 + 925 = 1257 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 92 × 77 = 7092 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 394 + 347 = 741 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 54 × 48 = 2585 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 95 × 27 = 2565 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 17 × 25 = 424 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 647 + 306 = 953 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 236 + 747 = 987 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 588 + 933 = 1527 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 309 + 945 = 1256 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 922 + 965 = 1896 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 436 + 892 = 1328 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 875 + 312 = 1187 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 268 + 722 = 999 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 43 × 90 = 3872 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 284 + 975 = 1258 right or wrong? (a) Right (b) Wrong

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