Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 678 · 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 94 × 98 = 9212 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 635 + 833 = 1468 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 760 + 204 = 968 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 16 × 29 = 464 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 38 × 30 = 1140 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 474 + 425 = 899 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 93 = 6889 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 549 + 709 = 1258 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 79 = 2379 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 354 + 126 = 480 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 39 × 27 = 1047 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 24 × 16 = 384 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 14 × 30 = 418 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 113 + 387 = 508 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 37 × 45 = 1657 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 460 + 278 = 738 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 119 + 614 = 734 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 15 × 17 = 255 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 80 × 13 = 1033 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 64 × 82 = 5257 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 690 + 992 = 1687 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 69 × 82 = 5651 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 93 = 2984 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 72 × 17 = 1224 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 940 + 643 = 1583 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 98 = 9611 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 18 × 15 = 274 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 637 + 678 = 1314 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 95 × 99 = 9399 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 74 × 21 = 1557 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 485 + 634 = 1111 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 44 = 960 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 986 + 543 = 1537 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 51 × 89 = 4537 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 378 + 203 = 581 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 27 × 62 = 1674 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 445 + 535 = 980 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 68 × 65 = 4420 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 552 + 738 = 1290 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 53 × 97 = 5141 right or wrong? (a) Wrong (b) Right

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