Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 720 · 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 319 + 785 = 1104 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 373 + 361 = 734 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 715 + 334 = 1049 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 258 + 591 = 850 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 79 × 52 = 4100 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 44 × 90 = 3960 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 34 × 88 = 2992 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 92 × 23 = 2107 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 63 × 32 = 2018 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 797 + 419 = 1221 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 28 × 79 = 2211 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 152 + 883 = 1035 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 528 + 143 = 674 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 94 × 53 = 4982 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 71 × 17 = 1207 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 71 × 85 = 6037 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 57 × 92 = 5244 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 80 × 85 = 6800 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 80 × 71 = 5676 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 86 × 60 = 5160 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 90 × 60 = 5400 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 87 = 7308 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 259 + 183 = 440 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 402 + 300 = 702 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 40 × 16 = 638 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 38 × 68 = 2584 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 79 = 7663 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 326 + 222 = 545 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 712 + 744 = 1460 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 616 + 195 = 804 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 281 + 654 = 933 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 19 × 68 = 1284 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 806 + 683 = 1489 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 211 + 664 = 867 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 896 + 925 = 1812 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 81 × 58 = 4698 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 86 × 44 = 3787 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 72 × 29 = 2088 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 122 + 546 = 668 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 651 + 660 = 1319 right or wrong? (a) Wrong (b) Right

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