Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 944 · 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 78 × 82 = 6396 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 366 + 516 = 881 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 86 × 29 = 2494 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 501 + 293 = 792 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 88 × 69 = 6072 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 12 × 25 = 300 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 82 × 42 = 3444 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 510 + 892 = 1402 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 48 × 84 = 4040 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 111 + 574 = 693 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 74 × 26 = 1916 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 143 + 141 = 284 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 292 + 316 = 610 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 21 × 48 = 1000 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 78 × 70 = 5460 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 82 × 19 = 1558 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 614 + 453 = 1067 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 623 + 376 = 999 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 82 × 29 = 2370 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 914 + 914 = 1821 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 21 = 461 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 45 × 23 = 1039 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 675 + 338 = 1013 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 270 + 696 = 967 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 80 × 25 = 1992 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 445 + 608 = 1053 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 682 + 235 = 920 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 79 × 23 = 1811 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 74 = 6512 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 864 + 156 = 1020 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 677 + 338 = 1015 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 910 + 281 = 1198 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 55 × 24 = 1320 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 69 × 31 = 2135 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 275 + 341 = 614 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 308 + 293 = 593 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 82 × 81 = 6639 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 82 × 75 = 6146 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 231 + 571 = 811 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 163 + 127 = 289 right or wrong? (a) Wrong (b) Right

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