Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 779 · 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 21 × 89 = 1869 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 60 × 27 = 1620 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 287 + 657 = 944 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 803 + 354 = 1157 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 454 + 132 = 584 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 537 + 415 = 952 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 420 + 654 = 1074 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 394 + 685 = 1079 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 40 × 35 = 1400 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 593 + 376 = 969 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 309 + 706 = 1015 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 825 + 399 = 1224 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 316 + 258 = 574 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 225 + 320 = 540 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 270 + 913 = 1181 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 142 + 168 = 315 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 59 × 34 = 2008 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 41 × 95 = 3895 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 82 × 23 = 1886 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 724 + 339 = 1063 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 53 × 74 = 3928 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 71 × 83 = 5893 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 26 × 53 = 1378 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 26 × 43 = 1124 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 74 × 85 = 6287 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 879 + 535 = 1414 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 831 + 810 = 1633 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 682 + 376 = 1061 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 12 × 66 = 792 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 42 × 71 = 2988 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 34 × 90 = 3060 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 844 + 263 = 1107 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 78 × 73 = 5694 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 907 + 374 = 1281 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 44 × 38 = 1672 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 116 + 970 = 1086 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 12 × 46 = 552 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 44 × 22 = 968 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 19 = 304 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 768 + 913 = 1676 right or wrong? (a) Right (b) Wrong

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