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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 183 · 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 63 =
  2. 2.Double 42 =
  3. 3.Half of 90 =
  4. 4.Half of 186 =
  5. 5.Half of 98 =
  6. 6.Double 53 =
  7. 7.Double 78 =
  8. 8.Half of 124 =
  9. 9.Double 29 =
  10. 10.Half of 62 =
  11. 11.Double 99 =
  12. 12.Double 51 =
  13. 13.Half of 128 =
  14. 14.Half of 196 =
  15. 15.Double 54 =
  16. 16.Double 33 =
  17. 17.Double 43 =
  18. 18.Half of 44 =
  19. 19.Half of 74 =
  20. 20.Half of 46 =
  21. 21.Double 57 =
  22. 22.Half of 36 =
  23. 23.Half of 34 =
  24. 24.Half of 52 =
  25. 25.Half of 38 =
  26. 26.Double 16 =
  27. 27.Half of 156 =
  28. 28.Half of 108 =
  29. 29.Double 96 =
  30. 30.Double 52 =
  31. 31.Half of 66 =
  32. 32.Double 39 =
  33. 33.Half of 116 =
  34. 34.Double 32 =
  35. 35.Double 28 =
  36. 36.Double 26 =
  37. 37.Double 46 =
  38. 38.Double 85 =
  39. 39.Double 91 =
  40. 40.Double 31 =

Answer key

  1. 126
  2. 84
  3. 45
  4. 93
  5. 49
  6. 106
  7. 156
  8. 62
  9. 58
  10. 31
  11. 198
  12. 102
  13. 64
  14. 98
  15. 108
  16. 66
  17. 86
  18. 22
  19. 37
  20. 23
  21. 114
  22. 18
  23. 17
  24. 26
  25. 19
  26. 32
  27. 78
  28. 54
  29. 192
  30. 104
  31. 33
  32. 78
  33. 58
  34. 64
  35. 56
  36. 52
  37. 92
  38. 170
  39. 182
  40. 62

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