Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 160 · 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 222 + 143 = 370 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 52 × 99 = 5145 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 64 × 36 = 2309 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 199 + 127 = 335 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 68 × 74 = 5032 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 33 × 97 = 3201 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 24 × 46 = 1104 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 65 = 914 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 66 × 63 = 4158 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 430 + 360 = 786 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 671 + 751 = 1421 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 17 × 88 = 1490 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 750 + 633 = 1387 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 525 + 137 = 662 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 541 + 812 = 1346 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 24 × 31 = 746 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 877 + 130 = 1007 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 634 + 372 = 1006 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 82 × 25 = 2050 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 352 + 111 = 463 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 37 × 68 = 2513 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 43 × 67 = 2881 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 14 × 56 = 783 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 21 × 91 = 1917 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 61 × 44 = 2684 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 57 × 25 = 1421 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 132 + 837 = 978 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 92 × 63 = 5796 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 279 + 492 = 776 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 99 × 70 = 6939 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 254 + 666 = 925 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 74 × 29 = 2153 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 88 × 78 = 6864 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 186 + 469 = 655 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 98 × 61 = 5971 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 65 × 81 = 5262 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 35 × 26 = 910 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 157 + 397 = 554 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 324 + 945 = 1269 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 993 + 323 = 1316 right or wrong? (a) Wrong (b) Right

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