Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 657 · 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 656 + 778 = 1427 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 43 × 39 = 1684 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 630 + 867 = 1497 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 20 × 37 = 740 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 870 + 140 = 1010 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 13 × 68 = 875 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 674 + 330 = 1001 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 482 + 142 = 625 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 99 × 26 = 2574 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 94 × 97 = 9112 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 470 + 864 = 1328 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 798 + 877 = 1674 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 822 + 999 = 1821 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 262 + 359 = 621 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 811 + 366 = 1177 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 669 + 626 = 1288 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 944 + 142 = 1086 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 115 + 128 = 243 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 18 × 70 = 1256 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 96 × 22 = 2107 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 107 + 429 = 536 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 317 + 488 = 805 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 575 + 983 = 1558 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 55 × 33 = 1815 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 60 × 32 = 1920 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 70 × 32 = 2240 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 542 + 179 = 713 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 13 × 57 = 735 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 491 + 290 = 783 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 374 + 978 = 1352 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 78 × 34 = 2654 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 82 = 8036 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 18 × 37 = 666 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 328 + 561 = 896 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 398 + 739 = 1137 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 88 × 53 = 4664 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 144 + 978 = 1122 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 92 × 24 = 2208 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 445 + 810 = 1255 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 535 + 288 = 823 right or wrong? (a) Wrong (b) Right

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