Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 846 · 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 292 + 607 = 899 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 86 × 97 = 8342 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 761 + 243 = 1004 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 409 + 290 = 693 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 70 × 77 = 5389 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 176 + 365 = 541 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 76 × 17 = 1295 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 88 × 13 = 1135 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 465 + 116 = 581 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 89 × 19 = 1697 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 47 × 81 = 3807 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 14 × 19 = 264 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 204 + 808 = 1012 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 46 = 1334 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 15 × 13 = 198 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 351 + 696 = 1047 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 68 × 86 = 5855 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 592 + 633 = 1231 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 586 + 895 = 1474 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 315 + 824 = 1139 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 602 + 736 = 1340 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 51 × 64 = 3264 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 41 × 95 = 3895 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 259 + 889 = 1148 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 18 × 52 = 936 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 750 + 120 = 866 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 43 × 25 = 1075 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 284 + 900 = 1187 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 689 + 643 = 1332 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 933 + 152 = 1085 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 83 × 42 = 3494 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 192 + 533 = 733 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 911 + 348 = 1259 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 170 + 936 = 1106 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 97 × 51 = 4947 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 657 + 320 = 980 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 68 × 90 = 6124 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 883 + 755 = 1631 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 31 × 43 = 1327 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 85 × 34 = 2891 right or wrong? (a) Right (b) Wrong

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