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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 195 · 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 22 =
  2. 2.Double 24 =
  3. 3.Half of 94 =
  4. 4.Half of 58 =
  5. 5.Double 26 =
  6. 6.Double 54 =
  7. 7.Half of 88 =
  8. 8.Half of 138 =
  9. 9.Double 85 =
  10. 10.Double 62 =
  11. 11.Half of 84 =
  12. 12.Half of 154 =
  13. 13.Double 92 =
  14. 14.Double 81 =
  15. 15.Half of 50 =
  16. 16.Half of 136 =
  17. 17.Double 96 =
  18. 18.Half of 180 =
  19. 19.Double 44 =
  20. 20.Double 91 =
  21. 21.Double 87 =
  22. 22.Double 17 =
  23. 23.Half of 188 =
  24. 24.Half of 192 =
  25. 25.Half of 74 =
  26. 26.Double 65 =
  27. 27.Double 51 =
  28. 28.Double 43 =
  29. 29.Half of 90 =
  30. 30.Double 33 =
  31. 31.Half of 60 =
  32. 32.Half of 166 =
  33. 33.Half of 106 =
  34. 34.Double 31 =
  35. 35.Double 75 =
  36. 36.Half of 102 =
  37. 37.Half of 46 =
  38. 38.Half of 86 =
  39. 39.Half of 96 =
  40. 40.Half of 176 =

Answer key

  1. 44
  2. 48
  3. 47
  4. 29
  5. 52
  6. 108
  7. 44
  8. 69
  9. 170
  10. 124
  11. 42
  12. 77
  13. 184
  14. 162
  15. 25
  16. 68
  17. 192
  18. 90
  19. 88
  20. 182
  21. 174
  22. 34
  23. 94
  24. 96
  25. 37
  26. 130
  27. 102
  28. 86
  29. 45
  30. 66
  31. 30
  32. 83
  33. 53
  34. 62
  35. 150
  36. 51
  37. 23
  38. 43
  39. 48
  40. 88

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