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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 623 · 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 26 =
  2. 2.Double 53 =
  3. 3.Half of 38 =
  4. 4.Double 83 =
  5. 5.Double 84 =
  6. 6.Double 67 =
  7. 7.Half of 132 =
  8. 8.Double 62 =
  9. 9.Half of 180 =
  10. 10.Double 78 =
  11. 11.Half of 84 =
  12. 12.Half of 70 =
  13. 13.Double 74 =
  14. 14.Double 17 =
  15. 15.Double 52 =
  16. 16.Double 64 =
  17. 17.Double 48 =
  18. 18.Double 51 =
  19. 19.Half of 134 =
  20. 20.Half of 100 =
  21. 21.Half of 42 =
  22. 22.Double 24 =
  23. 23.Double 46 =
  24. 24.Double 35 =
  25. 25.Double 96 =
  26. 26.Double 92 =
  27. 27.Half of 104 =
  28. 28.Double 98 =
  29. 29.Double 66 =
  30. 30.Double 21 =
  31. 31.Half of 130 =
  32. 32.Double 55 =
  33. 33.Double 41 =
  34. 34.Double 65 =
  35. 35.Double 61 =
  36. 36.Double 69 =
  37. 37.Double 77 =
  38. 38.Half of 46 =
  39. 39.Half of 112 =
  40. 40.Half of 32 =

Answer key

  1. 13
  2. 106
  3. 19
  4. 166
  5. 168
  6. 134
  7. 66
  8. 124
  9. 90
  10. 156
  11. 42
  12. 35
  13. 148
  14. 34
  15. 104
  16. 128
  17. 96
  18. 102
  19. 67
  20. 50
  21. 21
  22. 48
  23. 92
  24. 70
  25. 192
  26. 184
  27. 52
  28. 196
  29. 132
  30. 42
  31. 65
  32. 110
  33. 82
  34. 130
  35. 122
  36. 138
  37. 154
  38. 23
  39. 56
  40. 16

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