Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 221 · 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 34 × 35 = 1193 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 967 + 699 = 1668 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 60 = 1011 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 168 + 538 = 714 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 713 + 223 = 936 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 20 × 80 = 1603 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 281 + 846 = 1127 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 26 × 69 = 1794 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 113 + 740 = 853 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 19 × 40 = 757 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 36 × 90 = 3240 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 762 + 656 = 1410 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 84 = 1512 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 112 + 871 = 982 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 45 × 94 = 4230 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 57 × 50 = 2850 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 27 × 51 = 1383 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 820 + 853 = 1682 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 778 + 192 = 979 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 73 × 85 = 6205 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 143 + 816 = 959 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 199 + 366 = 565 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 30 × 66 = 1989 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 382 + 468 = 847 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 777 + 255 = 1032 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 331 + 871 = 1202 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 420 + 398 = 818 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 718 + 419 = 1137 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 66 × 66 = 4364 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 589 + 511 = 1100 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 624 + 324 = 948 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 95 = 2096 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 95 × 89 = 8461 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 75 × 21 = 1576 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 898 + 651 = 1553 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 79 × 75 = 5933 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 57 × 89 = 5073 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 34 = 646 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 29 = 1068 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 23 × 85 = 1955 right or wrong? (a) Right (b) Wrong

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