Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 789 · 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 314 + 289 = 603 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 28 = 560 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 663 + 618 = 1278 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 322 + 673 = 995 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 92 × 34 = 3120 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 259 + 490 = 744 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 984 + 741 = 1725 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 71 × 70 = 4975 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 387 + 304 = 693 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 20 × 46 = 911 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 248 + 156 = 404 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 71 = 1136 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 669 + 124 = 793 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 557 + 310 = 859 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 908 + 604 = 1512 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 166 + 970 = 1134 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 884 + 153 = 1037 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 82 = 1063 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 706 + 970 = 1676 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 93 × 70 = 6512 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 438 + 480 = 924 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 824 + 712 = 1541 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 62 × 63 = 3907 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 72 = 4176 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 80 × 87 = 6960 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 44 × 92 = 4048 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 112 + 413 = 525 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 93 = 1395 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 57 × 65 = 3705 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 61 × 40 = 2448 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 339 + 142 = 481 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 515 + 565 = 1080 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 99 × 94 = 9306 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 68 × 81 = 5508 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 852 + 939 = 1791 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 924 + 563 = 1484 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 93 × 87 = 8090 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 549 + 768 = 1317 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 713 + 523 = 1230 right or wrong? (a) Right (b) Wrong

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