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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 585 · 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 21 =
  2. 2.Double 34 =
  3. 3.Double 17 =
  4. 4.Half of 76 =
  5. 5.Half of 106 =
  6. 6.Double 63 =
  7. 7.Half of 170 =
  8. 8.Double 64 =
  9. 9.Half of 98 =
  10. 10.Double 61 =
  11. 11.Double 42 =
  12. 12.Double 55 =
  13. 13.Double 46 =
  14. 14.Half of 144 =
  15. 15.Half of 152 =
  16. 16.Double 52 =
  17. 17.Double 83 =
  18. 18.Double 57 =
  19. 19.Half of 128 =
  20. 20.Double 87 =
  21. 21.Half of 104 =
  22. 22.Half of 50 =
  23. 23.Double 28 =
  24. 24.Half of 118 =
  25. 25.Half of 64 =
  26. 26.Double 67 =
  27. 27.Double 91 =
  28. 28.Half of 142 =
  29. 29.Half of 140 =
  30. 30.Half of 88 =
  31. 31.Half of 138 =
  32. 32.Half of 52 =
  33. 33.Double 96 =
  34. 34.Half of 44 =
  35. 35.Half of 168 =
  36. 36.Double 81 =
  37. 37.Half of 58 =
  38. 38.Half of 184 =
  39. 39.Half of 26 =
  40. 40.Half of 156 =

Answer key

  1. 42
  2. 68
  3. 34
  4. 38
  5. 53
  6. 126
  7. 85
  8. 128
  9. 49
  10. 122
  11. 84
  12. 110
  13. 92
  14. 72
  15. 76
  16. 104
  17. 166
  18. 114
  19. 64
  20. 174
  21. 52
  22. 25
  23. 56
  24. 59
  25. 32
  26. 134
  27. 182
  28. 71
  29. 70
  30. 44
  31. 69
  32. 26
  33. 192
  34. 22
  35. 84
  36. 162
  37. 29
  38. 92
  39. 13
  40. 78

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