Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 216 · 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 181 + 382 = 563 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 168 + 856 = 1018 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 50 × 92 = 4595 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 27 × 90 = 2430 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 212 + 569 = 781 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 657 + 907 = 1564 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 52 × 32 = 1656 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 155 + 621 = 776 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 303 + 875 = 1178 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 74 × 87 = 6441 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 81 × 30 = 2421 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 665 + 265 = 925 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 727 + 634 = 1361 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 776 + 331 = 1111 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 88 × 23 = 2028 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 255 + 164 = 420 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 22 × 21 = 462 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 37 × 26 = 962 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 60 × 39 = 2331 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 546 + 346 = 892 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 282 + 452 = 734 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 283 + 163 = 450 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 364 + 126 = 496 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 866 + 288 = 1152 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 926 + 628 = 1553 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 115 + 471 = 586 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 90 × 51 = 4598 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 99 × 16 = 1584 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 106 + 526 = 633 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 71 = 3976 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 13 × 33 = 429 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 84 × 22 = 1844 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 970 + 542 = 1512 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 482 + 351 = 833 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 65 × 84 = 5466 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 13 × 59 = 767 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 885 + 380 = 1268 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 92 × 29 = 2660 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 31 × 85 = 2635 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 69 × 86 = 5934 right or wrong? (a) Right (b) Wrong

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