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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 787 · 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 44 =
  2. 2.Half of 68 =
  3. 3.Half of 28 =
  4. 4.Half of 114 =
  5. 5.Double 25 =
  6. 6.Half of 38 =
  7. 7.Double 58 =
  8. 8.Double 96 =
  9. 9.Half of 144 =
  10. 10.Double 85 =
  11. 11.Half of 138 =
  12. 12.Double 74 =
  13. 13.Half of 88 =
  14. 14.Double 62 =
  15. 15.Double 65 =
  16. 16.Double 46 =
  17. 17.Double 56 =
  18. 18.Double 51 =
  19. 19.Double 16 =
  20. 20.Double 61 =
  21. 21.Double 77 =
  22. 22.Double 45 =
  23. 23.Half of 148 =
  24. 24.Half of 124 =
  25. 25.Double 57 =
  26. 26.Double 47 =
  27. 27.Double 42 =
  28. 28.Half of 66 =
  29. 29.Half of 166 =
  30. 30.Double 97 =
  31. 31.Half of 106 =
  32. 32.Double 88 =
  33. 33.Double 68 =
  34. 34.Double 84 =
  35. 35.Double 31 =
  36. 36.Half of 74 =
  37. 37.Half of 182 =
  38. 38.Double 63 =
  39. 39.Double 23 =
  40. 40.Double 44 =

Answer key

  1. 22
  2. 34
  3. 14
  4. 57
  5. 50
  6. 19
  7. 116
  8. 192
  9. 72
  10. 170
  11. 69
  12. 148
  13. 44
  14. 124
  15. 130
  16. 92
  17. 112
  18. 102
  19. 32
  20. 122
  21. 154
  22. 90
  23. 74
  24. 62
  25. 114
  26. 94
  27. 84
  28. 33
  29. 83
  30. 194
  31. 53
  32. 176
  33. 136
  34. 168
  35. 62
  36. 37
  37. 91
  38. 126
  39. 46
  40. 88

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