Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 805 · 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 220 + 539 = 758 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 33 × 13 = 433 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 44 × 60 = 2645 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 27 × 99 = 2673 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 17 × 20 = 349 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 34 × 57 = 1938 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 512 + 958 = 1470 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 209 + 387 = 600 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 71 × 67 = 4757 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 147 + 719 = 858 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 73 × 53 = 3869 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 961 + 761 = 1730 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 89 × 57 = 5073 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 88 × 64 = 5632 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 16 × 53 = 846 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 57 × 22 = 1254 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 32 × 66 = 2112 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 72 × 14 = 1004 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 280 + 686 = 962 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 859 + 925 = 1777 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 666 + 244 = 907 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 761 + 552 = 1313 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 58 = 1567 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 180 + 651 = 829 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 73 × 33 = 2416 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 828 + 669 = 1497 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 26 × 96 = 2489 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 40 = 1040 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 28 × 20 = 569 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 131 + 134 = 265 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 23 = 740 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 295 + 571 = 867 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 647 + 516 = 1157 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 573 + 623 = 1201 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 93 × 39 = 3631 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 651 + 207 = 858 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 764 + 124 = 880 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 861 + 373 = 1234 right or wrong? (a) Wrong (b) Right

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