Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 220 · 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 68 × 88 = 5984 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 583 + 969 = 1561 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 505 + 690 = 1195 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 489 + 215 = 709 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 15 = 473 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 17 × 81 = 1368 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 98 × 52 = 5096 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 67 × 50 = 3348 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 218 + 938 = 1156 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 47 × 98 = 4613 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 48 × 75 = 3600 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 152 + 152 = 311 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 515 + 407 = 922 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 799 + 976 = 1782 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 324 + 758 = 1082 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 262 + 545 = 808 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 844 + 658 = 1502 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 531 + 431 = 967 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 948 + 558 = 1510 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 31 × 42 = 1302 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 114 + 830 = 944 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 77 × 30 = 2310 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 815 + 804 = 1619 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 29 × 46 = 1334 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 629 + 237 = 869 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 333 + 277 = 610 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 597 + 599 = 1203 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 728 + 601 = 1329 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 830 + 875 = 1710 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 229 + 678 = 910 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 500 + 677 = 1177 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 532 + 663 = 1195 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 786 + 990 = 1774 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 87 × 88 = 7655 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 95 × 17 = 1615 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 63 × 42 = 2646 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 803 + 439 = 1242 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 70 × 60 = 4200 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 166 + 712 = 878 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 33 × 50 = 1650 right or wrong? (a) Right (b) Wrong

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