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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 24 · 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.Double 68 =
  2. 2.Double 76 =
  3. 3.Double 63 =
  4. 4.Double 28 =
  5. 5.Double 65 =
  6. 6.Half of 106 =
  7. 7.Half of 150 =
  8. 8.Double 25 =
  9. 9.Double 36 =
  10. 10.Double 98 =
  11. 11.Half of 118 =
  12. 12.Double 55 =
  13. 13.Double 64 =
  14. 14.Double 73 =
  15. 15.Half of 56 =
  16. 16.Half of 162 =
  17. 17.Half of 124 =
  18. 18.Half of 72 =
  19. 19.Double 97 =
  20. 20.Half of 116 =
  21. 21.Double 51 =
  22. 22.Double 47 =
  23. 23.Half of 156 =
  24. 24.Double 81 =
  25. 25.Half of 180 =
  26. 26.Double 45 =
  27. 27.Double 23 =
  28. 28.Half of 134 =
  29. 29.Double 48 =
  30. 30.Half of 58 =
  31. 31.Double 52 =
  32. 32.Half of 184 =
  33. 33.Half of 96 =
  34. 34.Double 57 =
  35. 35.Double 91 =
  36. 36.Half of 158 =
  37. 37.Double 78 =
  38. 38.Double 89 =
  39. 39.Half of 108 =
  40. 40.Double 44 =

Answer key

  1. 136
  2. 152
  3. 126
  4. 56
  5. 130
  6. 53
  7. 75
  8. 50
  9. 72
  10. 196
  11. 59
  12. 110
  13. 128
  14. 146
  15. 28
  16. 81
  17. 62
  18. 36
  19. 194
  20. 58
  21. 102
  22. 94
  23. 78
  24. 162
  25. 90
  26. 90
  27. 46
  28. 67
  29. 96
  30. 29
  31. 104
  32. 92
  33. 48
  34. 114
  35. 182
  36. 79
  37. 156
  38. 178
  39. 54
  40. 88

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