Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 903 · 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 764 + 755 = 1517 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 27 × 92 = 2486 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 19 × 32 = 608 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 438 + 626 = 1065 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 618 + 306 = 932 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 126 + 720 = 846 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 513 + 821 = 1332 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 293 + 874 = 1167 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 35 × 60 = 2107 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 590 + 764 = 1348 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 17 × 29 = 493 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 47 = 705 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 68 × 71 = 4828 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 86 × 55 = 4730 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 50 × 76 = 3800 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 162 + 582 = 744 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 16 × 20 = 320 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 512 + 624 = 1136 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 69 × 46 = 3173 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 24 × 80 = 1923 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 35 × 85 = 2975 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 568 + 979 = 1547 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 290 + 200 = 489 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 94 × 20 = 1871 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 15 × 28 = 420 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 12 × 13 = 165 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 56 × 97 = 5430 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 53 × 48 = 2544 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 507 + 832 = 1334 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 342 + 183 = 524 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 46 × 41 = 1886 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 922 + 235 = 1161 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 717 + 364 = 1081 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 188 + 634 = 818 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 131 + 513 = 647 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 64 × 70 = 4481 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 78 × 78 = 6084 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 53 × 64 = 3387 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 734 + 634 = 1373 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 99 × 13 = 1284 right or wrong? (a) Wrong (b) Right

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