Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 589 · 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 85 × 59 = 5007 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 751 + 220 = 971 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 72 × 89 = 6408 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 488 + 966 = 1454 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 57 × 19 = 1083 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 67 × 86 = 5765 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 46 × 71 = 3266 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 53 × 44 = 2326 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 688 + 115 = 803 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 719 + 107 = 826 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 45 × 77 = 3469 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 623 + 217 = 840 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 322 + 223 = 544 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 52 = 2964 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 693 + 218 = 911 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 95 × 16 = 1527 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 17 × 25 = 425 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 80 × 39 = 3120 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 98 × 15 = 1464 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 15 × 35 = 525 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 521 + 305 = 828 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 140 + 584 = 722 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 29 × 41 = 1189 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 19 × 18 = 342 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 509 + 359 = 868 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 259 + 881 = 1140 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 23 × 74 = 1705 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 912 + 695 = 1604 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 46 × 19 = 876 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 48 × 22 = 1056 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 80 × 51 = 4080 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 246 + 426 = 670 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 228 + 390 = 618 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 593 + 114 = 706 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 360 + 511 = 869 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 16 × 18 = 293 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 414 + 263 = 670 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 526 + 371 = 897 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 23 × 29 = 675 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 926 + 761 = 1686 right or wrong? (a) Right (b) Wrong

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