Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 347 · 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 62 × 18 = 1108 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 44 × 97 = 4268 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 98 × 57 = 5586 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 79 × 15 = 1182 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 72 = 5904 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 690 + 820 = 1501 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 554 + 231 = 785 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 871 + 300 = 1173 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 79 × 22 = 1738 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 45 × 77 = 3465 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 77 × 48 = 3696 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 98 × 16 = 1577 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 43 × 89 = 3827 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 22 × 83 = 1826 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 687 + 558 = 1254 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 18 × 85 = 1536 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 14 × 33 = 462 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 68 × 15 = 1020 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 13 × 21 = 265 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 295 + 316 = 609 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 36 × 31 = 1121 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 12 × 12 = 144 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 62 × 88 = 5457 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 68 × 20 = 1363 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 97 = 5432 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 56 × 22 = 1232 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 69 × 74 = 5106 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 784 + 456 = 1240 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 136 + 490 = 634 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 68 × 14 = 954 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 826 + 848 = 1668 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 946 + 230 = 1176 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 95 = 1235 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 836 + 277 = 1113 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 947 + 403 = 1356 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 395 + 337 = 732 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 934 + 970 = 1904 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 15 × 50 = 748 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 660 + 176 = 834 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 58 × 65 = 3770 right or wrong? (a) Wrong (b) Right

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