Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 898 · 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 64 × 44 = 2816 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 73 × 78 = 5685 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 515 + 122 = 637 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 912 + 907 = 1819 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 52 × 56 = 2912 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 23 × 33 = 760 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 683 + 350 = 1033 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 14 × 55 = 769 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 751 + 959 = 1710 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 62 × 31 = 1917 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 884 + 291 = 1175 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 553 + 196 = 749 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 695 + 253 = 948 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 77 × 33 = 2541 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 130 + 990 = 1120 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 423 + 308 = 731 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 86 × 31 = 2666 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 96 = 3168 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 195 + 658 = 862 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 20 × 81 = 1618 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 46 × 83 = 3811 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 41 × 22 = 898 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 490 + 381 = 879 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 19 × 31 = 589 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 972 + 473 = 1445 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 45 × 78 = 3503 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 99 × 12 = 1188 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 28 × 22 = 613 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 24 × 79 = 1896 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 70 × 18 = 1257 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 900 + 674 = 1579 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 58 × 22 = 1284 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 244 + 944 = 1188 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 89 × 23 = 2047 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 46 × 67 = 3079 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 987 + 712 = 1699 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 341 + 428 = 769 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 83 × 33 = 2739 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 28 × 79 = 2219 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 40 × 41 = 1640 right or wrong? (a) Wrong (b) Right

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