Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 840 · 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 69 × 42 = 2898 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 343 + 318 = 661 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 89 × 33 = 2937 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 494 + 132 = 626 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 281 + 422 = 709 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 40 = 760 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 817 + 114 = 929 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 344 + 277 = 614 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 39 × 63 = 2465 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 94 × 35 = 3290 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 456 + 279 = 735 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 291 + 977 = 1263 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 18 × 16 = 282 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 60 × 21 = 1260 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 476 + 440 = 916 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 45 × 43 = 1926 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 94 × 89 = 8366 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 993 + 931 = 1921 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 99 = 6534 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 185 + 872 = 1057 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 170 + 738 = 908 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 350 + 600 = 950 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 357 + 299 = 648 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 36 × 23 = 821 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 51 × 96 = 4896 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 948 + 728 = 1676 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 658 + 347 = 1005 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 48 = 3643 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 418 + 139 = 555 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 757 + 358 = 1115 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 23 × 12 = 276 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 860 + 284 = 1142 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 74 × 69 = 5099 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 93 × 19 = 1767 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 39 × 48 = 1871 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 913 + 708 = 1615 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 26 × 22 = 572 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 878 + 569 = 1447 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 23 × 40 = 920 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 157 + 534 = 686 right or wrong? (a) Wrong (b) Right

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