Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 708 · 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 13 × 89 = 1152 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 94 × 37 = 3475 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 45 = 1620 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 98 × 67 = 6573 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 46 × 80 = 3681 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 20 × 53 = 1056 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 69 × 21 = 1449 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 364 + 633 = 1004 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 711 + 610 = 1321 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 815 + 467 = 1284 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 79 × 65 = 5142 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 946 + 369 = 1315 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 12 × 73 = 876 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 277 + 149 = 426 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 474 + 342 = 822 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 68 × 99 = 6730 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 854 + 585 = 1439 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 396 + 285 = 686 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 47 × 65 = 3062 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 634 + 300 = 931 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 696 + 492 = 1188 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 864 + 841 = 1711 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 74 × 93 = 6881 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 621 + 128 = 740 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 113 + 326 = 446 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 819 + 376 = 1195 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 437 + 642 = 1079 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 27 × 45 = 1214 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 558 + 862 = 1420 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 117 + 916 = 1033 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 670 + 215 = 885 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 878 + 704 = 1582 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 31 = 1203 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 321 + 548 = 869 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 39 × 67 = 2606 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 696 + 459 = 1155 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 523 + 699 = 1222 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 235 + 271 = 506 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 359 + 986 = 1345 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 297 + 864 = 1161 right or wrong? (a) Wrong (b) Right

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