Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 663 · 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 × 81 = 5591 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 356 + 305 = 657 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 48 × 20 = 966 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 53 × 56 = 2973 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 907 + 806 = 1718 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 79 × 25 = 1975 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 853 + 304 = 1156 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 95 × 65 = 6176 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 51 × 30 = 1530 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 90 × 92 = 8274 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 214 + 626 = 835 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 396 + 879 = 1275 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 63 × 81 = 5103 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 53 × 24 = 1281 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 75 × 72 = 5400 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 561 + 516 = 1077 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 545 + 958 = 1503 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 877 + 271 = 1148 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 626 + 121 = 745 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 823 + 243 = 1066 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 98 × 22 = 2156 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 119 + 882 = 1001 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 231 + 373 = 604 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 799 + 257 = 1056 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 621 + 533 = 1146 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 261 + 208 = 469 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 687 + 225 = 912 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 367 + 349 = 716 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 942 + 851 = 1793 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 17 × 60 = 1011 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 39 × 19 = 741 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 65 × 41 = 2665 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 377 + 468 = 845 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 921 + 400 = 1321 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 67 × 71 = 4759 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 71 × 34 = 2413 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 805 + 334 = 1139 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 66 = 788 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 44 × 68 = 2983 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 39 × 94 = 3669 right or wrong? (a) Right (b) Wrong

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