Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 177 · 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 476 + 174 = 650 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 77 × 36 = 2780 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 19 × 99 = 1884 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 30 × 20 = 600 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 24 × 51 = 1224 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 161 + 502 = 661 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 407 + 308 = 712 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 570 + 619 = 1196 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 841 + 475 = 1320 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 968 + 315 = 1284 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 485 + 905 = 1395 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 80 × 47 = 3759 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 60 × 41 = 2455 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 24 × 56 = 1344 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 327 + 578 = 905 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 811 + 735 = 1546 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 337 + 257 = 594 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 712 + 300 = 1012 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 84 × 94 = 7900 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 63 × 92 = 5792 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 125 + 137 = 262 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 99 × 43 = 4257 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 680 + 358 = 1038 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 33 × 48 = 1575 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 494 + 510 = 1006 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 61 × 30 = 1833 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 450 + 248 = 698 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 21 × 78 = 1639 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 862 + 978 = 1840 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 14 × 36 = 507 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 70 × 28 = 1960 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 248 + 748 = 990 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 99 × 39 = 3861 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 12 × 18 = 208 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 119 + 962 = 1088 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 57 × 45 = 2567 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 308 + 266 = 565 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 20 × 96 = 1927 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 94 = 2068 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 585 + 619 = 1203 right or wrong? (a) Right (b) Wrong

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