Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 655 · 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 12 × 69 = 826 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 715 + 448 = 1163 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 331 + 357 = 688 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 19 × 76 = 1444 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 68 × 37 = 2516 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 50 × 59 = 2950 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 460 + 493 = 953 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 851 + 695 = 1546 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 79 × 54 = 4272 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 76 × 45 = 3420 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 63 × 73 = 4599 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 454 + 224 = 678 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 900 + 277 = 1177 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 49 × 40 = 1960 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 36 × 49 = 1764 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 52 × 34 = 1768 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 46 × 75 = 3450 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 76 × 16 = 1214 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 45 × 34 = 1521 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 503 + 936 = 1439 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 631 + 524 = 1152 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 846 + 493 = 1339 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 74 × 92 = 6817 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 469 + 476 = 946 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 67 × 18 = 1214 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 95 = 9215 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 36 × 88 = 3173 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 28 × 58 = 1622 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 36 × 34 = 1226 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 56 × 61 = 3416 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 47 × 41 = 1927 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 93 × 94 = 8736 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 25 × 27 = 673 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 34 = 3163 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 97 × 38 = 3679 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 51 × 72 = 3663 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 86 × 49 = 4214 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 99 × 98 = 9696 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 323 + 958 = 1281 right or wrong? (a) Wrong (b) Right

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