Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 738 · 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 73 × 92 = 6716 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 30 × 19 = 570 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 88 × 97 = 8531 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 687 + 660 = 1347 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 61 × 17 = 1037 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 43 × 89 = 3827 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 30 = 599 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 361 + 237 = 598 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 70 × 49 = 3430 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 916 + 694 = 1612 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 946 + 237 = 1174 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 68 = 2377 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 644 + 262 = 906 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 37 = 1082 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 53 × 59 = 3127 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 928 + 290 = 1225 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 947 + 354 = 1301 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 498 + 526 = 1024 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 56 × 14 = 784 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 167 + 119 = 286 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 404 + 246 = 650 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 21 × 14 = 293 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 94 × 95 = 8930 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 85 × 53 = 4504 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 59 × 65 = 3834 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 352 + 227 = 578 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 81 = 7456 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 220 + 557 = 770 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 428 + 144 = 572 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 63 × 56 = 3535 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 62 × 85 = 5270 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 379 + 508 = 884 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 877 + 484 = 1361 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 340 + 880 = 1220 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 975 + 396 = 1372 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 32 × 66 = 2108 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 51 × 27 = 1381 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 398 + 452 = 850 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 14 × 34 = 476 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 712 + 790 = 1509 right or wrong? (a) Right (b) Wrong

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