Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 806 · 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 110 + 688 = 798 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 72 × 98 = 7048 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 214 + 748 = 966 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 676 + 549 = 1225 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 23 × 69 = 1581 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 282 + 424 = 706 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 15 × 28 = 413 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 558 + 250 = 808 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 93 × 82 = 7626 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 114 + 841 = 955 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 43 × 32 = 1376 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 69 × 94 = 6486 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 45 × 96 = 4320 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 461 + 671 = 1131 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 43 × 93 = 4004 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 58 × 72 = 4176 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 79 × 30 = 2370 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 21 × 25 = 524 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 41 × 15 = 614 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 444 + 622 = 1071 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 69 × 17 = 1173 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 87 × 66 = 5742 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 170 + 427 = 591 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 40 × 60 = 2400 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 639 + 745 = 1384 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 20 × 32 = 640 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 63 × 19 = 1197 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 63 × 16 = 1008 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 56 = 2236 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 59 × 33 = 1938 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 57 × 55 = 3135 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 22 × 70 = 1540 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 74 × 35 = 2599 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 918 + 931 = 1849 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 44 × 42 = 1855 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 12 × 65 = 776 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 31 × 36 = 1124 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 878 + 975 = 1852 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 553 + 388 = 933 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 33 × 91 = 3003 right or wrong? (a) Right (b) Wrong

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