Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 518 · 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 19 × 69 = 1310 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 37 × 73 = 2701 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 673 + 258 = 931 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 34 × 37 = 1265 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 986 + 827 = 1804 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 428 + 859 = 1287 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 592 + 512 = 1099 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 98 × 19 = 1870 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 38 × 67 = 2542 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 16 = 1264 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 314 + 152 = 475 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 107 + 867 = 974 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 798 + 819 = 1624 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 58 × 20 = 1160 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 542 + 567 = 1109 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 41 × 98 = 4018 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 76 × 49 = 3724 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 111 + 895 = 998 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 54 × 31 = 1678 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 70 × 91 = 6370 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 181 + 715 = 896 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 55 × 55 = 3022 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 84 × 88 = 7392 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 381 + 629 = 1010 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 124 + 719 = 843 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 85 × 30 = 2548 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 65 × 94 = 6110 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 29 = 899 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 851 + 597 = 1446 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 16 × 58 = 928 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 67 × 53 = 3551 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 74 × 64 = 4736 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 34 × 69 = 2346 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 225 + 373 = 598 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 31 × 34 = 1054 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 468 + 193 = 661 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 90 × 33 = 2978 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 198 + 513 = 711 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 688 + 653 = 1336 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 51 × 56 = 2856 right or wrong? (a) Right (b) Wrong

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