Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 13 · 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 596 + 784 = 1371 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 14 × 92 = 1290 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 62 × 15 = 930 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 795 + 768 = 1563 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 77 × 25 = 1925 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 54 × 73 = 3941 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 371 + 169 = 534 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 30 = 1770 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 957 + 650 = 1607 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 640 + 379 = 1019 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 40 × 86 = 3432 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 698 + 843 = 1548 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 84 × 71 = 5955 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 18 × 81 = 1461 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 46 × 55 = 2530 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 35 × 14 = 490 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 740 + 865 = 1605 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 268 + 593 = 861 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 638 + 612 = 1250 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 645 + 108 = 755 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 389 + 843 = 1232 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 16 × 67 = 1072 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 64 × 81 = 5184 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 34 × 12 = 408 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 722 + 370 = 1084 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 814 + 825 = 1648 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 55 × 16 = 880 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 30 × 25 = 741 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 28 × 18 = 507 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 379 + 816 = 1194 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 454 + 631 = 1094 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 393 + 390 = 783 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 439 + 666 = 1105 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 784 + 827 = 1608 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 976 + 378 = 1354 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 52 = 3804 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 130 + 933 = 1063 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 55 × 27 = 1485 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 28 = 840 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 887 + 909 = 1796 right or wrong? (a) Wrong (b) Right

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