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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 244 · 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 40 =
  2. 2.Half of 138 =
  3. 3.Double 85 =
  4. 4.Double 63 =
  5. 5.Half of 182 =
  6. 6.Half of 100 =
  7. 7.Double 26 =
  8. 8.Double 42 =
  9. 9.Half of 50 =
  10. 10.Double 23 =
  11. 11.Double 51 =
  12. 12.Double 99 =
  13. 13.Half of 164 =
  14. 14.Half of 120 =
  15. 15.Half of 196 =
  16. 16.Half of 112 =
  17. 17.Double 78 =
  18. 18.Double 31 =
  19. 19.Half of 148 =
  20. 20.Double 44 =
  21. 21.Double 95 =
  22. 22.Half of 188 =
  23. 23.Double 36 =
  24. 24.Double 43 =
  25. 25.Half of 68 =
  26. 26.Half of 168 =
  27. 27.Double 57 =
  28. 28.Double 93 =
  29. 29.Half of 128 =
  30. 30.Half of 58 =
  31. 31.Double 72 =
  32. 32.Half of 66 =
  33. 33.Half of 32 =
  34. 34.Double 55 =
  35. 35.Half of 124 =
  36. 36.Half of 102 =
  37. 37.Half of 132 =
  38. 38.Half of 34 =
  39. 39.Double 69 =
  40. 40.Half of 122 =

Answer key

  1. 20
  2. 69
  3. 170
  4. 126
  5. 91
  6. 50
  7. 52
  8. 84
  9. 25
  10. 46
  11. 102
  12. 198
  13. 82
  14. 60
  15. 98
  16. 56
  17. 156
  18. 62
  19. 74
  20. 88
  21. 190
  22. 94
  23. 72
  24. 86
  25. 34
  26. 84
  27. 114
  28. 186
  29. 64
  30. 29
  31. 144
  32. 33
  33. 16
  34. 110
  35. 62
  36. 51
  37. 66
  38. 17
  39. 138
  40. 61

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