Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 21 · 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 21 × 25 = 525 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 55 × 98 = 5385 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 826 + 255 = 1089 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 89 × 80 = 7119 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 908 + 109 = 1017 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 243 + 786 = 1029 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 90 × 31 = 2788 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 93 × 17 = 1587 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 17 × 71 = 1207 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 99 × 86 = 8514 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 80 × 19 = 1520 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 20 × 91 = 1820 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 367 + 768 = 1141 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 930 + 566 = 1495 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 24 × 13 = 303 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 731 + 186 = 917 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 247 + 213 = 469 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 195 + 252 = 450 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 75 × 71 = 5333 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 77 × 54 = 4158 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 318 + 221 = 539 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 288 + 694 = 982 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 111 + 629 = 740 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 89 = 5153 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 364 + 600 = 964 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 585 + 363 = 951 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 46 × 98 = 4512 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 932 + 630 = 1562 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 46 × 77 = 3542 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 13 × 50 = 650 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 301 + 794 = 1097 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 69 × 62 = 4278 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 341 + 353 = 694 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 525 + 186 = 711 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 964 + 105 = 1069 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 814 + 410 = 1221 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 423 + 947 = 1370 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 279 + 170 = 450 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 60 × 55 = 3291 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 93 × 29 = 2702 right or wrong? (a) Right (b) Wrong

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