Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 817 · 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 18 × 21 = 378 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 50 × 92 = 4600 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 92 × 69 = 6348 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 53 × 70 = 3709 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 41 × 99 = 4065 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 898 + 677 = 1568 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 21 × 20 = 420 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 25 × 98 = 2450 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 774 + 527 = 1301 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 21 × 84 = 1763 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 51 = 1887 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 53 × 62 = 3295 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 68 = 1437 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 67 × 55 = 3677 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 43 × 49 = 2098 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 538 + 266 = 804 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 609 + 213 = 831 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 23 × 42 = 966 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 60 × 82 = 4924 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 33 × 37 = 1221 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 92 × 39 = 3588 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 612 + 554 = 1167 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 969 + 885 = 1854 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 130 + 363 = 493 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 578 + 605 = 1178 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 66 × 84 = 5544 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 35 = 2205 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 23 × 12 = 278 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 40 × 44 = 1758 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 96 × 80 = 7684 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 45 × 32 = 1434 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 21 × 51 = 1071 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 84 × 99 = 8310 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 113 + 411 = 526 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 75 × 69 = 5169 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 155 + 298 = 451 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 23 × 84 = 1932 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 58 = 2433 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 854 + 261 = 1115 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 36 = 1611 right or wrong? (a) Wrong (b) Right

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