Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 153 · 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 197 + 206 = 403 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 45 × 16 = 720 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 26 × 78 = 2024 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 177 + 942 = 1121 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 89 × 89 = 7916 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 45 × 53 = 2388 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 352 + 771 = 1123 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 99 = 3568 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 50 × 61 = 3045 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 339 + 358 = 697 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 759 + 551 = 1311 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 48 × 63 = 3033 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 73 × 13 = 948 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 67 × 88 = 5896 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 70 × 65 = 4550 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 25 × 48 = 1200 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 69 × 28 = 1932 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 85 × 33 = 2806 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 167 + 435 = 598 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 427 + 142 = 569 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 43 × 95 = 4092 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 952 + 463 = 1411 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 88 × 21 = 1841 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 98 × 69 = 6765 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 385 + 869 = 1254 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 50 × 12 = 607 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 16 × 46 = 736 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 97 × 36 = 3492 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 47 × 50 = 2350 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 13 × 52 = 681 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 406 + 548 = 954 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 557 + 959 = 1516 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 509 + 669 = 1187 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 492 + 823 = 1315 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 407 + 429 = 837 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 338 + 353 = 691 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 822 + 239 = 1061 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 942 + 783 = 1725 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 93 × 88 = 8184 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 732 + 777 = 1509 right or wrong? (a) Wrong (b) Right

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