Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 120 · 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 69 × 70 = 4821 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 389 + 515 = 896 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 28 × 52 = 1454 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 82 × 21 = 1721 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 862 + 754 = 1616 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 445 + 142 = 587 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 900 + 495 = 1390 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 76 × 86 = 6529 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 55 × 28 = 1538 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 32 × 99 = 3168 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 240 + 553 = 793 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 717 + 462 = 1179 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 420 + 311 = 734 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 864 + 979 = 1843 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 229 + 976 = 1205 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 709 + 518 = 1227 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 82 × 71 = 5822 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 645 + 707 = 1352 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 45 × 31 = 1398 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 44 × 20 = 880 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 63 × 28 = 1764 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 62 × 13 = 812 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 64 × 24 = 1536 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 435 + 545 = 980 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 342 + 191 = 533 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 19 × 41 = 779 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 712 + 693 = 1405 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 630 + 827 = 1452 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 22 × 51 = 1123 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 711 + 834 = 1545 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 47 × 60 = 2811 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 88 × 12 = 1048 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 85 = 3145 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 171 + 240 = 419 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 86 = 6369 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 315 + 279 = 590 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 67 × 28 = 1876 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 75 × 44 = 3291 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 225 + 745 = 974 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 24 × 95 = 2288 right or wrong? (a) Right (b) Wrong

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