Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 144 · 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 74 × 88 = 6506 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 88 = 4491 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 810 + 941 = 1751 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 62 = 5955 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 34 × 31 = 1063 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 189 + 278 = 473 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 12 × 42 = 504 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 66 × 79 = 5214 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 53 × 70 = 3710 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 12 × 74 = 888 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 64 × 31 = 1978 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 583 + 612 = 1187 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 608 + 225 = 833 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 60 × 40 = 2400 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 64 × 86 = 5497 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 490 + 676 = 1166 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 61 × 64 = 3898 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 15 × 26 = 390 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 68 × 16 = 1091 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 54 × 16 = 864 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 763 + 258 = 1018 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 52 × 45 = 2340 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 23 × 39 = 897 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 66 = 2307 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 18 = 1386 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 69 × 68 = 4693 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 493 + 116 = 602 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 32 × 18 = 576 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 35 = 3085 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 15 × 39 = 585 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 61 × 23 = 1404 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 816 + 488 = 1304 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 23 = 299 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 180 + 755 = 943 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 82 × 84 = 6895 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 97 × 44 = 4268 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 92 × 79 = 7268 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 93 × 98 = 9119 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 95 × 76 = 7220 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 72 × 63 = 4536 right or wrong? (a) Wrong (b) Right

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