Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 342 · 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 140 + 171 = 311 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 218 + 333 = 550 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 76 = 5168 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 70 × 59 = 4130 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 139 + 808 = 947 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 98 × 80 = 7840 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 46 × 64 = 2944 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 146 + 475 = 621 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 40 × 17 = 689 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 74 × 91 = 6740 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 87 × 32 = 2777 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 695 + 961 = 1653 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 43 × 58 = 2494 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 27 = 459 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 282 + 957 = 1239 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 90 × 86 = 7744 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 78 × 32 = 2488 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 242 + 258 = 500 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 79 × 12 = 948 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 37 = 2515 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 778 + 951 = 1729 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 334 + 242 = 574 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 88 × 98 = 8630 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 54 × 17 = 918 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 791 + 134 = 916 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 182 + 311 = 493 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 72 × 80 = 5760 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 209 + 624 = 833 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 47 × 16 = 752 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 509 + 805 = 1314 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 458 + 987 = 1445 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 61 × 82 = 5004 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 194 + 353 = 547 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 911 + 652 = 1557 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 77 = 7315 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 921 + 672 = 1588 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 99 × 28 = 2770 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 864 + 243 = 1107 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 78 × 13 = 1007 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 567 + 648 = 1214 right or wrong? (a) Wrong (b) Right

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