Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 236 · 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 20 × 67 = 1341 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 368 + 387 = 755 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 379 + 162 = 548 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 29 = 928 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 71 × 29 = 2065 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 80 × 84 = 6716 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 69 = 2760 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 48 × 31 = 1497 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 60 × 80 = 4796 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 47 × 79 = 3713 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 973 + 716 = 1689 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 791 + 305 = 1093 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 205 + 412 = 617 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 879 + 749 = 1635 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 18 × 23 = 414 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 183 + 919 = 1093 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 32 × 46 = 1473 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 83 × 85 = 7055 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 519 + 842 = 1361 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 618 + 652 = 1270 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 90 × 12 = 1081 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 96 × 77 = 7397 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 474 + 576 = 1050 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 12 = 264 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 671 + 915 = 1586 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 42 × 34 = 1427 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 325 + 235 = 560 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 131 + 614 = 745 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 13 × 61 = 802 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 720 + 240 = 957 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 35 = 735 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 98 × 27 = 2638 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 579 + 434 = 1006 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 931 + 823 = 1757 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 642 + 364 = 1007 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 196 + 805 = 1001 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 366 + 500 = 857 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 80 × 93 = 7432 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 69 = 826 right or wrong? (a) Wrong (b) Right

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