Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 676 · 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 12 × 12 = 138 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 31 × 95 = 2945 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 45 × 83 = 3736 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 62 × 97 = 6014 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 575 + 160 = 726 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 39 × 58 = 2262 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 301 + 734 = 1035 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 80 × 14 = 1120 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 45 × 13 = 585 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 82 × 21 = 1722 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 33 × 48 = 1584 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 72 × 43 = 3096 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 76 × 86 = 6539 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 847 + 127 = 974 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 84 × 92 = 7728 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 93 × 51 = 4743 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 50 × 95 = 4750 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 646 + 357 = 1003 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 459 + 524 = 984 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 253 + 394 = 647 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 24 = 1856 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 60 = 4080 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 943 + 207 = 1150 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 25 × 79 = 1982 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 22 × 85 = 1870 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 37 × 17 = 631 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 539 + 413 = 952 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 57 × 69 = 3931 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 55 × 97 = 5335 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 48 × 89 = 4275 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 196 + 715 = 912 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 162 + 818 = 987 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 87 = 1740 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 874 + 385 = 1264 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 604 + 318 = 922 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 73 × 81 = 5913 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 376 + 168 = 544 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 50 × 31 = 1550 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 84 × 50 = 4209 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 900 + 451 = 1358 right or wrong? (a) Wrong (b) Right

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