Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 186 · 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 24 × 88 = 2112 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 313 + 522 = 835 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 178 + 850 = 1028 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 169 + 986 = 1153 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 974 + 410 = 1384 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 612 + 643 = 1259 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 67 × 19 = 1271 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 959 + 825 = 1781 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 32 × 75 = 2400 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 58 × 96 = 5573 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 80 × 48 = 3835 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 381 + 686 = 1069 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 58 × 37 = 2138 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 67 × 72 = 4824 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 94 × 94 = 8838 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 572 + 785 = 1357 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 95 × 14 = 1324 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 644 + 816 = 1466 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 35 × 48 = 1680 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 71 × 89 = 6325 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 368 + 430 = 798 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 976 + 367 = 1341 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 29 × 86 = 2486 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 34 × 17 = 578 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 227 + 292 = 519 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 59 × 71 = 4189 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 45 = 4140 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 16 × 67 = 1065 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 471 + 433 = 904 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 35 × 58 = 2030 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 187 + 753 = 948 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 78 × 29 = 2253 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 148 + 157 = 305 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 878 + 703 = 1581 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 919 + 298 = 1223 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 92 × 22 = 2024 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 91 × 88 = 8008 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 824 + 401 = 1225 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 66 = 1914 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 81 × 79 = 6397 right or wrong? (a) Wrong (b) Right

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