Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 570 · 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 946 + 650 = 1604 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 192 + 793 = 994 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 48 × 48 = 2304 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 213 + 964 = 1174 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 155 + 325 = 477 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 71 × 27 = 1917 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 84 × 89 = 7476 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 41 × 61 = 2500 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 319 + 115 = 441 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 946 + 178 = 1124 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 591 + 825 = 1414 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 407 + 324 = 731 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 42 × 67 = 2809 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 69 × 97 = 6693 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 34 × 22 = 748 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 83 = 2246 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 71 × 24 = 1713 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 110 + 122 = 225 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 985 + 478 = 1471 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 168 + 737 = 905 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 33 × 25 = 825 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 40 × 66 = 2633 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 32 × 93 = 2975 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 947 + 174 = 1121 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 61 × 77 = 4697 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 905 + 619 = 1522 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 15 = 453 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 848 + 696 = 1552 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 218 + 171 = 392 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 95 × 47 = 4457 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 71 × 68 = 4822 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 373 + 619 = 983 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 15 = 397 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 78 × 75 = 5850 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 86 × 52 = 4472 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 39 × 73 = 2848 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 500 + 139 = 630 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 19 × 71 = 1354 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 70 = 2589 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 457 + 552 = 1009 right or wrong? (a) Wrong (b) Right

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