Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 813 · 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 604 + 598 = 1202 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 595 + 949 = 1544 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 92 × 79 = 7260 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 868 + 108 = 976 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 280 + 681 = 962 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 52 × 88 = 4572 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 79 × 34 = 2686 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 120 + 258 = 370 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 377 + 447 = 824 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 27 × 33 = 882 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 58 × 98 = 5693 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 407 + 492 = 898 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 368 + 960 = 1328 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 195 + 795 = 990 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 74 × 85 = 6290 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 91 × 64 = 5830 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 30 × 18 = 548 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 44 × 57 = 2508 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 333 + 140 = 476 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 35 × 53 = 1850 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 22 × 82 = 1808 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 17 × 26 = 433 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 624 + 352 = 985 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 62 × 70 = 4345 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 142 + 734 = 876 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 235 + 687 = 920 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 451 + 297 = 741 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 50 × 34 = 1707 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 77 × 23 = 1774 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 618 + 841 = 1461 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 16 × 78 = 1248 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 14 × 93 = 1295 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 68 × 48 = 3264 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 386 + 370 = 756 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 344 + 456 = 800 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 114 + 308 = 429 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 70 × 55 = 3858 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 62 × 15 = 930 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 80 × 78 = 6240 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 485 + 220 = 705 right or wrong? (a) Wrong (b) Right

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