Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 232 · 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 817 + 418 = 1236 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 368 + 837 = 1204 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 111 + 493 = 604 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 24 × 14 = 327 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 16 × 36 = 576 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 496 + 897 = 1395 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 116 + 212 = 335 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 60 × 47 = 2820 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 80 × 91 = 7280 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 483 + 674 = 1161 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 554 + 206 = 762 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 20 × 27 = 549 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 14 × 74 = 1036 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 61 × 98 = 5987 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 34 × 38 = 1297 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 92 × 82 = 7543 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 45 × 14 = 630 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 855 + 395 = 1250 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 52 × 63 = 3276 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 179 + 872 = 1051 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 79 × 56 = 4424 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 674 + 695 = 1369 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 51 × 26 = 1328 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 73 = 942 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 31 × 47 = 1461 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 360 + 925 = 1285 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 726 + 159 = 882 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 411 + 453 = 856 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 46 × 34 = 1564 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 136 + 378 = 523 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 172 + 843 = 1015 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 80 × 77 = 6160 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 46 × 28 = 1297 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 210 + 170 = 382 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 262 + 236 = 498 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 580 + 825 = 1405 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 58 × 87 = 5041 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 88 × 62 = 5456 right or wrong? (a) Wrong (b) Right

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