Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 32 · 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 30 × 85 = 2550 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 386 + 529 = 911 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 669 + 794 = 1463 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 50 × 33 = 1650 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 535 + 157 = 692 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 77 × 32 = 2464 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 86 × 35 = 3010 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 293 + 305 = 598 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 361 + 469 = 830 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 56 × 48 = 2688 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 39 × 80 = 3120 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 308 + 544 = 859 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 745 + 844 = 1589 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 355 + 581 = 936 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 82 × 27 = 2214 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 94 × 25 = 2347 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 69 × 69 = 4761 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 489 + 186 = 667 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 570 + 557 = 1127 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 395 + 886 = 1276 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 340 + 381 = 721 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 39 = 663 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 352 + 428 = 780 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 23 × 38 = 873 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 95 × 42 = 3984 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 28 × 50 = 1405 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 917 + 849 = 1766 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 282 + 178 = 461 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 29 × 84 = 2445 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 16 × 30 = 480 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 32 × 15 = 480 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 484 + 119 = 597 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 95 × 33 = 3135 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 90 × 57 = 5130 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 84 × 47 = 3939 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 252 + 234 = 477 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 231 + 894 = 1126 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 50 × 94 = 4700 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 90 × 99 = 8917 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 68 × 56 = 3800 right or wrong? (a) Right (b) Wrong

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