Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 532 · 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 53 × 34 = 1802 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 46 × 39 = 1791 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 72 × 79 = 5691 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 53 × 59 = 3125 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 96 × 39 = 3737 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 78 × 83 = 6474 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 91 × 22 = 2002 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 803 + 189 = 995 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 42 × 35 = 1470 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 388 + 322 = 708 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 666 + 831 = 1497 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 34 = 2643 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 869 + 929 = 1789 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 58 × 82 = 4756 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 41 × 70 = 2877 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 82 × 72 = 5901 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 469 + 161 = 637 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 38 × 74 = 2811 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 646 + 769 = 1408 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 60 × 90 = 5400 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 757 + 468 = 1225 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 42 × 81 = 3397 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 68 × 85 = 5783 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 232 + 917 = 1149 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 31 × 73 = 2265 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 49 × 91 = 4459 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 654 + 230 = 884 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 47 × 80 = 3761 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 227 + 135 = 359 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 27 × 30 = 801 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 64 × 99 = 6340 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 977 + 722 = 1699 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 25 × 61 = 1518 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 61 × 83 = 5068 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 91 × 89 = 8099 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 548 + 295 = 836 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 115 + 264 = 385 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 45 × 75 = 3375 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 615 + 478 = 1085 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 94 × 37 = 3472 right or wrong? (a) Right (b) Wrong

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