Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 109 · 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 87 × 35 = 3041 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 382 + 806 = 1197 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 305 + 604 = 900 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 967 + 213 = 1180 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 574 + 655 = 1228 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 68 × 89 = 6052 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 15 × 33 = 495 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 244 + 124 = 366 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 22 × 86 = 1883 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 25 × 51 = 1275 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 80 × 97 = 7760 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 255 + 267 = 516 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 904 + 186 = 1090 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 440 + 324 = 755 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 593 + 135 = 728 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 15 × 36 = 534 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 28 = 735 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 98 × 83 = 8135 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 69 × 92 = 6343 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 43 × 61 = 2624 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 249 + 137 = 383 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 51 × 43 = 2193 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 34 × 32 = 1087 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 770 + 597 = 1369 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 259 + 251 = 501 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 55 × 32 = 1756 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 98 × 59 = 5773 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 309 + 856 = 1167 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 30 × 41 = 1225 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 350 + 930 = 1284 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 97 × 17 = 1651 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 74 × 86 = 6364 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 34 × 89 = 3026 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 95 = 5032 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 63 × 39 = 2457 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 73 × 54 = 3942 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 333 + 464 = 797 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 999 + 383 = 1382 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 470 + 610 = 1080 right or wrong? (a) Right (b) Wrong

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