Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 314 · 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 34 × 12 = 406 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 34 × 92 = 3128 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 583 + 126 = 709 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 55 = 2033 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 264 + 897 = 1161 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 53 × 68 = 3604 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 33 × 19 = 627 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 88 × 87 = 7651 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 886 + 613 = 1499 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 781 + 509 = 1285 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 964 + 548 = 1512 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 47 × 15 = 705 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 376 + 959 = 1330 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 22 × 65 = 1430 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 430 + 119 = 548 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 538 + 717 = 1259 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 695 + 771 = 1473 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 64 × 21 = 1335 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 189 + 358 = 544 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 98 × 20 = 1966 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 23 × 20 = 457 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 478 + 277 = 755 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 63 × 99 = 6228 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 800 + 832 = 1628 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 13 × 49 = 641 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 462 + 781 = 1243 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 80 × 27 = 2164 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 95 × 48 = 4551 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 745 + 909 = 1654 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 16 × 37 = 592 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 34 × 16 = 544 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 36 × 28 = 1011 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 308 + 653 = 963 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 41 × 79 = 3242 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 783 + 524 = 1307 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 299 + 857 = 1156 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 287 + 639 = 926 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 231 + 216 = 443 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 69 × 61 = 4209 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 628 + 401 = 1029 right or wrong? (a) Wrong (b) Right

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