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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 280 · 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 54 =
  2. 2.Double 55 =
  3. 3.Double 73 =
  4. 4.Double 16 =
  5. 5.Half of 186 =
  6. 6.Half of 146 =
  7. 7.Double 31 =
  8. 8.Double 46 =
  9. 9.Double 83 =
  10. 10.Half of 164 =
  11. 11.Double 85 =
  12. 12.Double 39 =
  13. 13.Double 69 =
  14. 14.Half of 72 =
  15. 15.Half of 98 =
  16. 16.Half of 102 =
  17. 17.Double 34 =
  18. 18.Half of 120 =
  19. 19.Double 81 =
  20. 20.Half of 86 =
  21. 21.Double 75 =
  22. 22.Double 77 =
  23. 23.Double 79 =
  24. 24.Half of 44 =
  25. 25.Half of 96 =
  26. 26.Half of 178 =
  27. 27.Half of 168 =
  28. 28.Double 51 =
  29. 29.Double 22 =
  30. 30.Double 65 =
  31. 31.Half of 74 =
  32. 32.Half of 148 =
  33. 33.Half of 62 =
  34. 34.Half of 156 =
  35. 35.Double 53 =
  36. 36.Double 27 =
  37. 37.Double 21 =
  38. 38.Half of 116 =
  39. 39.Half of 142 =
  40. 40.Double 74 =

Answer key

  1. 108
  2. 110
  3. 146
  4. 32
  5. 93
  6. 73
  7. 62
  8. 92
  9. 166
  10. 82
  11. 170
  12. 78
  13. 138
  14. 36
  15. 49
  16. 51
  17. 68
  18. 60
  19. 162
  20. 43
  21. 150
  22. 154
  23. 158
  24. 22
  25. 48
  26. 89
  27. 84
  28. 102
  29. 44
  30. 130
  31. 37
  32. 74
  33. 31
  34. 78
  35. 106
  36. 54
  37. 42
  38. 58
  39. 71
  40. 148

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