Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 751 · 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 417 + 905 = 1322 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 21 × 97 = 2044 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 91 × 97 = 8827 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 30 × 84 = 2522 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 76 × 70 = 5323 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 577 + 316 = 893 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 419 + 785 = 1208 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 46 × 39 = 1792 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 32 × 97 = 3105 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 36 × 66 = 2383 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 450 + 658 = 1108 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 685 + 996 = 1681 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 29 × 79 = 2291 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 52 × 76 = 3952 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 23 × 82 = 1879 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 357 + 339 = 696 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 968 + 247 = 1215 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 79 × 31 = 2442 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 62 × 16 = 990 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 505 + 666 = 1175 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 553 + 752 = 1298 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 384 + 258 = 642 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 671 + 278 = 949 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 67 × 19 = 1273 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 53 × 65 = 3445 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 38 × 96 = 3651 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 83 × 96 = 7968 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 850 + 741 = 1583 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 359 + 320 = 678 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 89 × 98 = 8722 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 917 + 450 = 1368 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 67 × 94 = 6298 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 667 + 115 = 782 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 18 × 34 = 612 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 68 × 16 = 1085 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 514 + 246 = 758 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 921 + 990 = 1915 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 657 + 361 = 1009 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 96 × 66 = 6336 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 70 × 37 = 2590 right or wrong? (a) Wrong (b) Right

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