Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 521 · 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 67 × 36 = 2412 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 18 = 1746 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 954 + 373 = 1327 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 256 + 781 = 1037 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 34 × 56 = 1904 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 531 + 107 = 638 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 587 + 340 = 924 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 26 × 24 = 630 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 111 + 597 = 708 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 751 + 303 = 1047 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 67 × 25 = 1675 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 672 + 502 = 1181 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 47 × 26 = 1230 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 95 × 45 = 4275 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 18 × 40 = 729 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 78 × 69 = 5382 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 58 × 90 = 5220 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 26 × 93 = 2418 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 340 + 638 = 970 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 970 + 928 = 1898 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 87 × 61 = 5306 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 180 + 654 = 834 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 25 × 30 = 750 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 358 + 418 = 776 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 166 + 197 = 363 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 47 × 50 = 2350 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 48 = 3072 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 433 + 599 = 1023 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 14 × 78 = 1085 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 32 × 21 = 671 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 269 + 895 = 1164 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 12 × 69 = 829 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 13 × 13 = 169 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 35 × 85 = 2975 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 982 + 828 = 1812 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 18 × 67 = 1213 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 460 + 228 = 681 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 22 × 83 = 1821 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 69 × 32 = 2208 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 61 = 2862 right or wrong? (a) Wrong (b) Right

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