Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 961 · 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 80 × 58 = 4640 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 62 × 90 = 5588 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 321 + 728 = 1047 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 255 + 251 = 509 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 31 × 30 = 930 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 107 + 640 = 740 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 268 + 228 = 494 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 36 = 2117 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 480 + 684 = 1162 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 89 × 36 = 3204 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 143 + 869 = 1009 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 16 × 79 = 1264 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 282 + 977 = 1263 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 609 + 419 = 1028 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 16 × 35 = 560 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 856 + 276 = 1132 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 24 × 23 = 549 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 70 × 26 = 1820 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 623 + 402 = 1025 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 53 × 17 = 901 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 52 × 46 = 2392 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 627 + 274 = 898 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 17 × 76 = 1292 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 60 × 14 = 840 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 87 × 24 = 2088 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 65 × 41 = 2665 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 15 = 1380 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 75 × 42 = 3142 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 515 + 775 = 1290 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 883 + 301 = 1184 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 47 × 16 = 757 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 125 + 487 = 614 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 990 + 801 = 1787 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 229 + 761 = 990 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 59 × 85 = 5015 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 17 × 37 = 629 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 30 × 34 = 1026 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 78 × 69 = 5381 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 166 + 557 = 723 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 51 × 88 = 4488 right or wrong? (a) Wrong (b) Right

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