Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 161 · 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 499 + 351 = 858 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 35 × 22 = 764 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 59 × 24 = 1416 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 294 + 611 = 905 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 875 + 450 = 1317 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 28 × 22 = 616 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 551 + 909 = 1465 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 154 + 982 = 1133 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 779 + 531 = 1310 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 83 × 99 = 8221 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 175 + 108 = 274 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 99 × 55 = 5445 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 14 × 41 = 579 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 54 × 30 = 1620 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 84 × 50 = 4196 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 267 + 924 = 1191 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 580 + 193 = 777 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 95 × 29 = 2755 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 74 × 67 = 4961 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 479 + 767 = 1246 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 97 × 75 = 7275 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 95 × 30 = 2850 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 130 + 337 = 467 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 30 × 79 = 2365 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 351 + 315 = 674 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 12 × 90 = 1083 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 887 + 520 = 1404 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 55 × 55 = 3018 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 568 + 311 = 876 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 98 × 73 = 7154 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 234 + 436 = 661 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 69 = 2424 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 609 + 238 = 847 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 112 + 280 = 393 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 41 × 65 = 2665 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 13 × 76 = 988 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 51 × 75 = 3825 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 47 × 30 = 1405 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 37 = 709 right or wrong? (a) Wrong (b) Right

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