Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 659 · 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 43 × 37 = 1591 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 24 × 56 = 1340 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 37 × 76 = 2812 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 582 + 254 = 830 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 839 + 925 = 1755 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 262 + 893 = 1160 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 180 + 891 = 1062 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 42 × 74 = 3108 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 337 + 923 = 1256 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 81 × 57 = 4617 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 917 + 534 = 1454 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 39 = 1371 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 32 × 89 = 2855 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 19 × 88 = 1672 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 465 + 774 = 1239 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 506 + 942 = 1447 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 62 × 87 = 5385 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 51 × 78 = 3978 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 91 × 21 = 1906 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 200 + 151 = 347 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 576 + 440 = 1014 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 51 × 30 = 1521 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 192 + 957 = 1154 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 265 + 698 = 963 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 550 + 962 = 1512 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 451 + 803 = 1245 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 14 × 83 = 1157 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 626 + 136 = 762 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 33 × 47 = 1551 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 52 × 42 = 2184 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 24 × 92 = 2208 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 63 × 97 = 6111 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 27 × 76 = 2052 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 40 × 87 = 3480 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 35 × 86 = 3010 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 98 × 50 = 4900 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 83 × 57 = 4731 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 44 = 2954 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 29 × 69 = 1993 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 482 + 993 = 1477 right or wrong? (a) Wrong (b) Right

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