Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 199 · 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 × 68 = 2316 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 56 × 47 = 2626 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 476 + 292 = 768 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 506 + 479 = 982 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 843 + 714 = 1557 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 78 × 43 = 3354 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 660 + 563 = 1223 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 18 × 49 = 882 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 857 + 900 = 1751 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 95 × 85 = 8079 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 189 + 187 = 384 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 20 × 55 = 1106 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 20 × 96 = 1920 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 655 + 388 = 1043 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 502 + 424 = 935 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 98 × 51 = 4998 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 518 + 557 = 1076 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 793 + 839 = 1632 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 368 + 676 = 1044 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 22 × 46 = 1012 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 75 × 96 = 7198 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 25 × 55 = 1371 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 196 + 213 = 403 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 30 × 42 = 1260 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 52 × 39 = 2031 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 91 × 85 = 7734 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 756 + 409 = 1165 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 791 + 310 = 1100 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 476 + 264 = 736 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 12 × 51 = 612 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 37 = 1258 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 76 × 62 = 4704 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 639 + 867 = 1506 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 740 + 292 = 1032 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 907 + 355 = 1253 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 70 × 86 = 6020 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 714 + 910 = 1632 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 77 × 45 = 3462 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 506 + 593 = 1099 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 87 × 83 = 7221 right or wrong? (a) Right (b) Wrong

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