Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 19 · 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 283 + 230 = 513 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 642 + 304 = 946 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 864 + 943 = 1807 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 738 + 948 = 1695 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 384 + 347 = 731 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 21 × 95 = 1995 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 806 + 584 = 1383 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 17 × 56 = 952 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 52 × 12 = 621 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 21 × 23 = 481 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 22 × 56 = 1232 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 44 × 86 = 3789 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 565 + 793 = 1358 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 491 + 270 = 761 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 36 × 32 = 1152 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 16 × 86 = 1376 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 29 × 77 = 2233 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 62 = 1745 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 79 × 43 = 3397 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 94 = 6392 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 223 + 863 = 1080 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 38 × 69 = 2622 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 155 + 696 = 851 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 252 + 362 = 614 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 21 = 1239 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 45 × 18 = 808 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 15 × 12 = 180 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 568 + 234 = 802 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 18 × 58 = 1042 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 219 + 426 = 648 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 83 × 57 = 4740 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 43 × 35 = 1505 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 81 × 19 = 1530 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 18 × 47 = 841 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 390 + 724 = 1114 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 47 × 85 = 3989 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 978 + 267 = 1245 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 93 × 31 = 2883 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 87 × 86 = 7474 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 811 + 499 = 1310 right or wrong? (a) Wrong (b) Right

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