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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 498 · 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 48 =
  2. 2.Double 31 =
  3. 3.Double 79 =
  4. 4.Double 21 =
  5. 5.Double 75 =
  6. 6.Double 81 =
  7. 7.Double 22 =
  8. 8.Half of 40 =
  9. 9.Half of 32 =
  10. 10.Half of 50 =
  11. 11.Double 53 =
  12. 12.Double 37 =
  13. 13.Double 58 =
  14. 14.Double 92 =
  15. 15.Half of 180 =
  16. 16.Double 67 =
  17. 17.Half of 82 =
  18. 18.Double 33 =
  19. 19.Double 69 =
  20. 20.Half of 56 =
  21. 21.Double 42 =
  22. 22.Half of 124 =
  23. 23.Half of 100 =
  24. 24.Double 24 =
  25. 25.Half of 140 =
  26. 26.Double 86 =
  27. 27.Double 16 =
  28. 28.Half of 76 =
  29. 29.Half of 190 =
  30. 30.Half of 88 =
  31. 31.Double 26 =
  32. 32.Double 72 =
  33. 33.Half of 114 =
  34. 34.Half of 122 =
  35. 35.Double 34 =
  36. 36.Double 66 =
  37. 37.Double 49 =
  38. 38.Double 83 =
  39. 39.Double 51 =
  40. 40.Half of 64 =

Answer key

  1. 96
  2. 62
  3. 158
  4. 42
  5. 150
  6. 162
  7. 44
  8. 20
  9. 16
  10. 25
  11. 106
  12. 74
  13. 116
  14. 184
  15. 90
  16. 134
  17. 41
  18. 66
  19. 138
  20. 28
  21. 84
  22. 62
  23. 50
  24. 48
  25. 70
  26. 172
  27. 32
  28. 38
  29. 95
  30. 44
  31. 52
  32. 144
  33. 57
  34. 61
  35. 68
  36. 132
  37. 98
  38. 166
  39. 102
  40. 32

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