Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 997 · 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 27 × 13 = 349 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 78 × 21 = 1638 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 737 + 900 = 1634 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 124 + 575 = 704 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 197 + 530 = 727 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 82 × 43 = 3526 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 906 + 168 = 1074 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 625 + 949 = 1571 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 43 × 92 = 3952 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 82 × 14 = 1148 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 243 + 129 = 363 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 926 + 941 = 1874 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 80 = 1671 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 70 × 85 = 5948 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 26 × 62 = 1612 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 90 × 48 = 4320 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 594 + 202 = 798 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 13 × 19 = 247 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 39 × 92 = 3590 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 794 + 159 = 962 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 26 × 72 = 1872 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 61 × 26 = 1586 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 75 × 36 = 2700 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 114 + 192 = 305 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 260 + 961 = 1221 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 67 × 17 = 1133 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 243 + 849 = 1093 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 68 × 91 = 6188 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 709 + 277 = 990 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 79 × 69 = 5451 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 84 × 34 = 2851 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 502 + 724 = 1226 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 31 × 36 = 1116 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 389 + 918 = 1307 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 437 + 316 = 755 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 992 + 795 = 1778 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 715 + 879 = 1594 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 488 + 589 = 1077 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 15 × 20 = 301 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 87 × 22 = 1914 right or wrong? (a) Wrong (b) Right

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