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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 129 · 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 84 =
  2. 2.Half of 160 =
  3. 3.Double 66 =
  4. 4.Double 62 =
  5. 5.Half of 186 =
  6. 6.Double 17 =
  7. 7.Half of 40 =
  8. 8.Double 43 =
  9. 9.Half of 30 =
  10. 10.Double 37 =
  11. 11.Double 31 =
  12. 12.Half of 90 =
  13. 13.Double 41 =
  14. 14.Double 81 =
  15. 15.Double 19 =
  16. 16.Half of 64 =
  17. 17.Double 28 =
  18. 18.Half of 36 =
  19. 19.Double 94 =
  20. 20.Double 76 =
  21. 21.Double 72 =
  22. 22.Double 18 =
  23. 23.Half of 48 =
  24. 24.Half of 74 =
  25. 25.Half of 180 =
  26. 26.Double 85 =
  27. 27.Half of 122 =
  28. 28.Double 21 =
  29. 29.Half of 196 =
  30. 30.Double 91 =
  31. 31.Double 63 =
  32. 32.Half of 68 =
  33. 33.Half of 128 =
  34. 34.Half of 44 =
  35. 35.Half of 28 =
  36. 36.Half of 66 =
  37. 37.Half of 104 =
  38. 38.Half of 50 =
  39. 39.Half of 130 =
  40. 40.Double 44 =

Answer key

  1. 42
  2. 80
  3. 132
  4. 124
  5. 93
  6. 34
  7. 20
  8. 86
  9. 15
  10. 74
  11. 62
  12. 45
  13. 82
  14. 162
  15. 38
  16. 32
  17. 56
  18. 18
  19. 188
  20. 152
  21. 144
  22. 36
  23. 24
  24. 37
  25. 90
  26. 170
  27. 61
  28. 42
  29. 98
  30. 182
  31. 126
  32. 34
  33. 64
  34. 22
  35. 14
  36. 33
  37. 52
  38. 25
  39. 65
  40. 88

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