Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 166 · 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 × 38 = 2622 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 172 + 158 = 330 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 353 + 783 = 1130 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 23 × 36 = 826 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 306 + 255 = 561 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 12 × 75 = 898 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 565 + 494 = 1059 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 36 × 68 = 2450 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 394 + 895 = 1289 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 52 × 16 = 837 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 42 × 58 = 2436 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 44 × 71 = 3123 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 13 × 33 = 431 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 80 × 19 = 1520 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 409 + 511 = 920 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 63 × 66 = 4158 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 645 + 591 = 1241 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 39 = 2270 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 32 × 30 = 959 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 81 × 33 = 2673 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 40 × 74 = 2960 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 144 + 266 = 410 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 28 × 66 = 1839 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 86 × 26 = 2231 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 21 × 50 = 1051 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 54 × 24 = 1296 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 464 + 202 = 666 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 24 × 94 = 2256 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 30 × 93 = 2790 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 92 × 30 = 2758 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 365 + 785 = 1150 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 30 × 99 = 2961 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 346 + 278 = 623 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 589 + 362 = 951 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 96 × 77 = 7389 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 988 + 474 = 1461 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 448 + 796 = 1244 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 168 + 446 = 623 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 537 + 316 = 857 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 489 + 995 = 1484 right or wrong? (a) Right (b) Wrong

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