Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 674 · 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 69 × 44 = 3031 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 192 + 143 = 335 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 55 × 56 = 3080 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 511 + 118 = 629 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 53 × 54 = 2862 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 73 × 69 = 5043 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 12 × 49 = 588 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 93 × 87 = 8097 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 64 × 29 = 1856 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 404 + 448 = 851 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 68 × 48 = 3266 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 29 × 60 = 1740 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 69 × 46 = 3177 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 99 × 76 = 7524 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 23 × 51 = 1173 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 514 + 639 = 1153 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 196 + 958 = 1155 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 343 + 628 = 967 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 27 × 55 = 1487 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 44 × 40 = 1761 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 88 × 20 = 1760 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 23 × 40 = 920 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 28 × 35 = 989 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 96 × 88 = 8448 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 75 × 31 = 2325 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 39 = 546 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 708 + 366 = 1074 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 83 × 63 = 5230 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 715 + 408 = 1123 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 43 × 92 = 3956 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 71 × 78 = 5534 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 21 × 92 = 1932 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 22 × 34 = 744 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 77 × 42 = 3237 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 392 + 909 = 1301 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 888 + 657 = 1544 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 60 × 31 = 1860 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 278 + 999 = 1277 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 83 × 61 = 5058 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 41 × 93 = 3812 right or wrong? (a) Right (b) Wrong

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