Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 107 · 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 406 + 647 = 1058 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 398 + 185 = 583 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 581 + 629 = 1210 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 208 + 106 = 314 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 18 × 89 = 1602 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 35 × 13 = 446 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 39 × 36 = 1409 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 120 + 134 = 254 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 69 × 28 = 1925 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 892 + 371 = 1263 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 840 + 253 = 1093 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 65 × 81 = 5265 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 88 = 2293 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 53 × 40 = 2118 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 96 × 78 = 7479 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 823 + 107 = 930 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 95 × 56 = 5327 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 32 × 94 = 3008 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 77 × 70 = 5390 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 52 × 65 = 3380 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 130 + 377 = 510 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 403 + 467 = 864 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 414 + 538 = 950 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 614 + 669 = 1288 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 611 + 959 = 1563 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 729 + 124 = 844 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 124 + 853 = 977 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 643 + 841 = 1493 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 78 × 87 = 6778 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 94 × 25 = 2357 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 25 × 52 = 1303 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 739 + 162 = 901 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 54 × 18 = 972 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 403 + 134 = 537 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 662 + 399 = 1058 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 90 × 78 = 7020 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 647 + 402 = 1049 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 106 + 884 = 997 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 32 = 1728 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 210 + 256 = 465 right or wrong? (a) Wrong (b) Right

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