Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 639 · 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 299 + 211 = 511 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 52 × 30 = 1560 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 41 × 71 = 2913 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 195 + 362 = 549 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 526 + 294 = 820 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 793 + 408 = 1201 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 87 = 8178 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 119 + 361 = 480 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 64 × 52 = 3328 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 774 + 698 = 1473 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 60 × 12 = 720 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 98 × 87 = 8528 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 215 + 119 = 337 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 470 + 706 = 1177 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 547 + 460 = 1007 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 223 + 532 = 763 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 86 × 46 = 3956 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 464 + 476 = 940 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 296 + 459 = 755 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 921 + 292 = 1213 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 45 × 47 = 2115 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 59 × 93 = 5487 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 874 + 493 = 1367 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 137 + 612 = 741 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 854 + 993 = 1846 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 43 × 30 = 1290 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 195 + 877 = 1072 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 49 × 67 = 3283 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 85 × 78 = 6630 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 849 + 258 = 1107 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 97 × 54 = 5238 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 94 × 87 = 8185 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 897 + 416 = 1307 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 83 × 68 = 5644 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 51 × 42 = 2142 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 63 × 25 = 1574 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 97 × 18 = 1746 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 98 = 1176 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 45 × 73 = 3288 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 38 × 33 = 1259 right or wrong? (a) Wrong (b) Right

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