Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 558 · 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 63 × 53 = 3332 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 954 + 344 = 1298 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 65 × 39 = 2535 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 77 × 39 = 3003 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 512 + 800 = 1304 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 939 + 558 = 1497 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 980 + 372 = 1352 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 208 + 286 = 494 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 63 = 1197 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 63 × 44 = 2763 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 874 + 328 = 1202 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 64 × 83 = 5312 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 24 × 32 = 774 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 30 × 73 = 2190 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 427 + 144 = 564 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 641 + 206 = 847 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 39 = 858 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 59 = 3311 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 92 × 28 = 2576 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 164 + 306 = 464 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 843 + 953 = 1796 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 381 + 208 = 589 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 753 + 845 = 1598 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 82 × 56 = 4592 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 47 = 612 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 28 × 85 = 2380 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 678 + 940 = 1619 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 698 + 689 = 1387 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 434 + 593 = 1033 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 45 × 14 = 630 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 49 × 78 = 3822 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 66 × 15 = 990 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 893 + 876 = 1778 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 134 + 338 = 474 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 93 × 35 = 3255 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 456 + 428 = 888 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 77 × 79 = 6085 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 968 + 316 = 1284 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 228 + 315 = 543 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 52 × 37 = 1923 right or wrong? (a) Wrong (b) Right

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