Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 189 · 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 51 × 26 = 1326 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 18 × 68 = 1216 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 64 × 39 = 2496 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 76 = 7294 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 83 × 78 = 6474 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 45 × 63 = 2835 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 78 × 28 = 2176 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 409 + 204 = 606 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 849 + 267 = 1120 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 36 × 41 = 1471 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 94 × 73 = 6862 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 93 = 1767 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 188 + 994 = 1182 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 457 + 126 = 583 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 79 × 35 = 2765 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 48 × 79 = 3795 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 949 + 846 = 1795 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 443 + 593 = 1036 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 718 + 317 = 1035 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 630 + 707 = 1334 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 35 × 29 = 1017 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 69 × 49 = 3377 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 96 × 99 = 9501 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 217 + 107 = 327 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 743 + 249 = 994 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 677 + 788 = 1469 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 55 × 86 = 4739 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 655 + 923 = 1578 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 72 × 47 = 3384 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 24 × 32 = 760 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 205 + 778 = 983 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 94 × 33 = 3109 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 910 + 325 = 1234 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 827 + 372 = 1199 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 399 + 595 = 994 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 19 × 92 = 1748 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 86 = 1032 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 84 × 86 = 7231 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 269 + 917 = 1186 right or wrong? (a) Right (b) Wrong

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