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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 337 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 28 =
  2. 2.Double 81 =
  3. 3.Half of 152 =
  4. 4.Half of 42 =
  5. 5.Double 21 =
  6. 6.Half of 172 =
  7. 7.Half of 58 =
  8. 8.Double 63 =
  9. 9.Double 84 =
  10. 10.Double 58 =
  11. 11.Double 23 =
  12. 12.Double 68 =
  13. 13.Double 64 =
  14. 14.Half of 140 =
  15. 15.Half of 82 =
  16. 16.Half of 198 =
  17. 17.Half of 38 =
  18. 18.Double 87 =
  19. 19.Half of 116 =
  20. 20.Double 33 =
  21. 21.Half of 182 =
  22. 22.Half of 94 =
  23. 23.Half of 108 =
  24. 24.Half of 90 =
  25. 25.Half of 126 =
  26. 26.Half of 174 =
  27. 27.Half of 98 =
  28. 28.Half of 96 =
  29. 29.Double 97 =
  30. 30.Double 91 =
  31. 31.Double 18 =
  32. 32.Half of 186 =
  33. 33.Half of 114 =
  34. 34.Half of 26 =
  35. 35.Double 88 =
  36. 36.Double 71 =
  37. 37.Half of 44 =
  38. 38.Double 27 =
  39. 39.Double 44 =
  40. 40.Half of 56 =

Answer key

  1. 14
  2. 162
  3. 76
  4. 21
  5. 42
  6. 86
  7. 29
  8. 126
  9. 168
  10. 116
  11. 46
  12. 136
  13. 128
  14. 70
  15. 41
  16. 99
  17. 19
  18. 174
  19. 58
  20. 66
  21. 91
  22. 47
  23. 54
  24. 45
  25. 63
  26. 87
  27. 49
  28. 48
  29. 194
  30. 182
  31. 36
  32. 93
  33. 57
  34. 13
  35. 176
  36. 142
  37. 22
  38. 54
  39. 88
  40. 28

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