Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 450 · 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 41 × 22 = 902 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 408 + 230 = 631 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 95 × 62 = 5892 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 39 × 88 = 3432 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 95 × 58 = 5519 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 71 × 31 = 2209 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 557 + 161 = 718 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 94 = 1322 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 15 × 93 = 1395 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 434 + 314 = 744 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 454 + 111 = 565 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 824 + 434 = 1256 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 79 = 1419 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 537 + 354 = 891 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 46 × 13 = 598 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 63 × 22 = 1394 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 996 + 948 = 1944 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 203 + 981 = 1182 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 59 × 25 = 1475 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 37 × 29 = 1071 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 76 × 33 = 2507 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 619 + 451 = 1070 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 600 + 346 = 947 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 16 × 52 = 832 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 53 × 13 = 689 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 46 × 20 = 920 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 42 × 36 = 1506 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 926 + 741 = 1659 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 589 + 841 = 1430 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 501 + 281 = 782 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 90 × 67 = 6030 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 23 × 45 = 1042 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 14 × 99 = 1386 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 18 × 51 = 918 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 62 × 89 = 5516 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 25 × 83 = 2074 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 580 + 441 = 1021 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 120 + 644 = 756 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 70 × 35 = 2446 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 44 × 74 = 3256 right or wrong? (a) Right (b) Wrong

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