Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 421 · 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 500 + 358 = 858 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 804 + 755 = 1554 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 46 × 84 = 3866 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 48 × 29 = 1399 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 434 + 540 = 968 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 272 + 621 = 892 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 76 × 95 = 7221 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 75 × 65 = 4877 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 46 × 79 = 3627 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 532 + 166 = 698 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 695 + 160 = 855 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 30 × 80 = 2400 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 328 + 614 = 942 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 61 × 34 = 2074 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 72 × 13 = 936 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 86 × 64 = 5504 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 45 × 13 = 585 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 41 = 1599 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 163 + 672 = 842 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 385 + 281 = 657 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 61 × 70 = 4270 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 484 + 566 = 1050 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 124 + 603 = 718 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 736 + 572 = 1308 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 117 + 958 = 1075 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 69 × 66 = 4552 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 36 × 44 = 1584 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 65 × 83 = 5395 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 910 + 633 = 1543 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 916 + 452 = 1368 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 580 + 311 = 891 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 23 × 56 = 1288 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 93 × 73 = 6789 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 263 + 916 = 1179 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 338 + 854 = 1183 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 753 + 695 = 1456 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 12 × 40 = 480 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 71 × 74 = 5254 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 75 = 2250 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 81 × 33 = 2673 right or wrong? (a) Wrong (b) Right

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