Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 148 · 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 26 × 33 = 858 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 36 = 1764 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 113 + 330 = 451 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 571 + 194 = 765 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 522 + 294 = 808 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 166 + 652 = 819 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 93 × 46 = 4279 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 86 = 3777 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 200 + 146 = 354 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 25 = 443 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 845 + 704 = 1556 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 640 + 910 = 1559 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 33 × 99 = 3267 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 50 × 39 = 1959 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 864 + 121 = 985 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 347 + 326 = 673 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 308 + 354 = 662 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 53 × 13 = 689 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 58 × 54 = 3133 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 269 + 290 = 565 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 668 + 905 = 1579 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 494 + 317 = 811 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 72 × 12 = 864 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 505 + 369 = 882 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 587 + 138 = 722 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 817 + 585 = 1402 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 98 × 91 = 8916 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 80 × 81 = 6480 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 574 + 966 = 1534 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 59 × 92 = 5428 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 461 + 263 = 724 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 327 + 793 = 1126 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 16 = 1050 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 796 + 660 = 1456 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 97 × 20 = 1940 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 307 + 700 = 1000 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 33 × 96 = 3164 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 488 + 848 = 1335 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 999 + 157 = 1148 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 26 × 83 = 2160 right or wrong? (a) Right (b) Wrong

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