Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 938 · 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 607 + 656 = 1270 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 25 × 88 = 2200 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 453 + 772 = 1224 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 707 + 282 = 982 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 36 × 13 = 468 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 89 × 49 = 4361 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 91 = 4732 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 38 × 32 = 1215 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 23 × 93 = 2138 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 18 × 43 = 774 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 423 + 216 = 643 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 91 × 71 = 6461 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 451 + 987 = 1438 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 35 × 94 = 3289 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 16 × 13 = 208 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 52 × 37 = 1927 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 42 × 34 = 1428 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 57 × 63 = 3591 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 36 × 80 = 2880 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 53 × 63 = 3339 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 72 × 21 = 1517 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 37 × 36 = 1324 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 36 × 49 = 1768 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 25 × 60 = 1500 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 379 + 330 = 709 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 691 + 908 = 1599 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 83 × 99 = 8210 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 589 + 684 = 1273 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 75 × 82 = 6148 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 16 × 28 = 443 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 76 × 69 = 5243 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 319 + 473 = 792 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 99 × 47 = 4653 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 956 + 227 = 1183 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 824 + 752 = 1583 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 32 × 16 = 507 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 32 × 79 = 2534 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 40 × 67 = 2680 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 35 × 31 = 1085 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 19 × 35 = 658 right or wrong? (a) Right (b) Wrong

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