Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 86 · 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 42 × 41 = 1720 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 749 + 910 = 1659 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 183 + 424 = 607 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 45 × 21 = 945 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 452 + 644 = 1089 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 55 × 52 = 2860 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 112 + 694 = 801 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 98 × 53 = 5194 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 49 × 70 = 3430 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 34 × 34 = 1156 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 166 + 710 = 876 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 18 × 85 = 1530 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 971 + 223 = 1187 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 506 + 565 = 1068 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 994 + 258 = 1261 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 88 × 40 = 3520 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 222 + 317 = 539 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 28 × 41 = 1148 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 90 × 27 = 2431 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 270 + 128 = 399 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 24 × 19 = 464 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 85 = 2723 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 91 × 88 = 8008 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 443 + 242 = 689 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 22 = 1961 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 790 + 447 = 1237 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 23 = 345 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 615 + 915 = 1530 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 54 × 50 = 2700 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 364 + 635 = 999 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 977 + 955 = 1936 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 76 × 45 = 3426 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 42 = 1134 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 558 + 142 = 692 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 269 + 202 = 471 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 385 + 955 = 1337 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 44 × 77 = 3388 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 269 + 625 = 892 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 18 = 774 right or wrong? (a) Right (b) Wrong

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