Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 224 · 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 127 + 631 = 758 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 240 + 338 = 578 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 81 = 2673 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 790 + 781 = 1569 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 60 × 74 = 4436 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 70 × 42 = 2933 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 28 × 95 = 2663 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 140 + 636 = 779 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 398 + 366 = 764 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 297 + 312 = 609 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 85 × 43 = 3649 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 814 + 215 = 1029 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 14 × 50 = 699 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 32 × 18 = 576 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 57 × 21 = 1190 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 359 + 937 = 1304 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 916 + 472 = 1388 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 94 × 16 = 1504 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 15 × 15 = 225 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 38 × 84 = 3192 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 94 × 93 = 8734 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 78 × 37 = 2883 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 77 × 29 = 2233 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 241 + 236 = 477 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 916 + 571 = 1487 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 946 + 477 = 1423 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 37 × 37 = 1368 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 248 + 899 = 1147 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 19 × 35 = 665 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 781 + 969 = 1748 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 954 + 749 = 1708 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 270 + 467 = 737 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 77 × 25 = 1925 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 47 × 35 = 1651 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 19 × 84 = 1596 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 279 + 196 = 483 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 57 × 19 = 1083 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 30 × 42 = 1262 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 67 × 86 = 5762 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 695 + 585 = 1280 right or wrong? (a) Right (b) Wrong

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