Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 146 · 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 736 + 657 = 1390 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 904 + 452 = 1356 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 734 + 156 = 890 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 15 × 59 = 885 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 46 × 29 = 1334 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 421 + 750 = 1171 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 75 × 23 = 1725 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 565 + 146 = 711 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 94 × 29 = 2726 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 20 × 41 = 823 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 319 + 716 = 1039 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 204 + 800 = 1007 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 959 + 408 = 1367 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 118 + 437 = 555 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 207 + 160 = 370 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 70 × 43 = 3010 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 772 + 998 = 1778 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 45 × 73 = 3279 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 262 + 443 = 706 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 997 + 503 = 1500 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 55 × 18 = 990 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 345 + 674 = 1018 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 86 × 53 = 4557 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 746 + 343 = 1089 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 432 + 118 = 552 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 66 × 88 = 5809 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 87 × 22 = 1914 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 12 × 62 = 737 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 13 × 55 = 722 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 41 × 20 = 829 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 48 × 22 = 1054 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 230 + 259 = 495 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 64 × 79 = 5051 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 98 × 79 = 7743 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 972 + 348 = 1319 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 877 + 779 = 1659 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 587 + 670 = 1257 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 29 × 58 = 1683 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 27 × 29 = 783 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 656 + 549 = 1213 right or wrong? (a) Right (b) Wrong

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