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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 314 · 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 158 =
  2. 2.Half of 180 =
  3. 3.Double 61 =
  4. 4.Double 92 =
  5. 5.Double 88 =
  6. 6.Half of 196 =
  7. 7.Double 24 =
  8. 8.Half of 40 =
  9. 9.Double 25 =
  10. 10.Double 36 =
  11. 11.Double 16 =
  12. 12.Half of 34 =
  13. 13.Double 82 =
  14. 14.Double 76 =
  15. 15.Double 43 =
  16. 16.Half of 150 =
  17. 17.Half of 54 =
  18. 18.Double 34 =
  19. 19.Half of 84 =
  20. 20.Half of 162 =
  21. 21.Half of 80 =
  22. 22.Double 31 =
  23. 23.Double 66 =
  24. 24.Double 49 =
  25. 25.Half of 136 =
  26. 26.Half of 124 =
  27. 27.Half of 140 =
  28. 28.Double 55 =
  29. 29.Double 72 =
  30. 30.Double 23 =
  31. 31.Double 32 =
  32. 32.Half of 146 =
  33. 33.Half of 160 =
  34. 34.Double 57 =
  35. 35.Half of 26 =
  36. 36.Half of 102 =
  37. 37.Double 51 =
  38. 38.Double 81 =
  39. 39.Half of 86 =
  40. 40.Half of 104 =

Answer key

  1. 79
  2. 90
  3. 122
  4. 184
  5. 176
  6. 98
  7. 48
  8. 20
  9. 50
  10. 72
  11. 32
  12. 17
  13. 164
  14. 152
  15. 86
  16. 75
  17. 27
  18. 68
  19. 42
  20. 81
  21. 40
  22. 62
  23. 132
  24. 98
  25. 68
  26. 62
  27. 70
  28. 110
  29. 144
  30. 46
  31. 64
  32. 73
  33. 80
  34. 114
  35. 13
  36. 51
  37. 102
  38. 162
  39. 43
  40. 52

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