Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 27 · 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 385 + 536 = 915 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 934 + 225 = 1158 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 80 × 87 = 6960 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 214 + 778 = 992 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 76 × 57 = 4334 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 822 + 224 = 1046 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 419 + 131 = 550 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 171 + 133 = 304 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 750 + 164 = 914 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 451 + 157 = 615 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 32 × 35 = 1125 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 80 × 30 = 2406 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 30 × 57 = 1710 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 75 = 4276 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 77 × 41 = 3157 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 95 × 92 = 8748 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 67 × 52 = 3484 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 611 + 521 = 1132 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 308 + 810 = 1126 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 16 × 18 = 288 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 421 + 362 = 783 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 277 + 817 = 1103 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 813 + 432 = 1245 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 13 × 29 = 368 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 751 + 772 = 1523 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 91 × 29 = 2648 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 54 × 61 = 3294 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 983 + 731 = 1714 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 37 × 57 = 2109 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 413 + 516 = 929 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 19 × 27 = 513 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 773 + 607 = 1380 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 34 = 2584 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 20 × 90 = 1795 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 859 + 665 = 1515 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 92 × 84 = 7728 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 715 + 835 = 1551 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 688 + 553 = 1236 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 21 × 18 = 381 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 553 + 262 = 822 right or wrong? (a) Right (b) Wrong

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