Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 10 · 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 365 + 989 = 1356 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 43 × 54 = 2313 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 246 + 390 = 636 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 46 × 77 = 3542 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 13 × 16 = 209 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 56 = 3802 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 34 × 32 = 1088 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 720 + 219 = 932 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 33 × 97 = 3201 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 352 + 779 = 1125 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 51 × 89 = 4535 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 78 × 65 = 5071 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 31 × 61 = 1891 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 45 × 66 = 2973 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 97 × 41 = 3968 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 171 + 121 = 294 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 18 × 32 = 577 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 54 × 66 = 3570 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 82 = 7790 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 78 × 25 = 1950 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 731 + 279 = 1010 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 533 + 565 = 1089 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 25 × 96 = 2406 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 61 × 61 = 3721 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 920 + 594 = 1507 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 77 × 73 = 5621 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 58 × 58 = 3357 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 30 × 34 = 1028 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 96 × 65 = 6240 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 456 + 835 = 1286 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 450 + 190 = 640 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 949 + 159 = 1108 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 89 × 73 = 6497 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 672 + 379 = 1051 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 25 × 88 = 2200 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 47 × 70 = 3296 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 872 + 336 = 1208 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 513 + 611 = 1124 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 130 + 184 = 314 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 34 × 68 = 2312 right or wrong? (a) Right (b) Wrong

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