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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 769 · 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 48 =
  2. 2.Double 67 =
  3. 3.Double 22 =
  4. 4.Half of 86 =
  5. 5.Double 33 =
  6. 6.Half of 174 =
  7. 7.Double 52 =
  8. 8.Double 27 =
  9. 9.Double 21 =
  10. 10.Double 81 =
  11. 11.Half of 134 =
  12. 12.Half of 46 =
  13. 13.Half of 126 =
  14. 14.Half of 26 =
  15. 15.Double 24 =
  16. 16.Double 51 =
  17. 17.Double 39 =
  18. 18.Half of 40 =
  19. 19.Half of 164 =
  20. 20.Double 43 =
  21. 21.Half of 36 =
  22. 22.Double 62 =
  23. 23.Half of 78 =
  24. 24.Double 95 =
  25. 25.Half of 110 =
  26. 26.Half of 54 =
  27. 27.Double 72 =
  28. 28.Double 35 =
  29. 29.Double 89 =
  30. 30.Double 68 =
  31. 31.Double 57 =
  32. 32.Half of 182 =
  33. 33.Half of 108 =
  34. 34.Half of 60 =
  35. 35.Double 45 =
  36. 36.Half of 148 =
  37. 37.Half of 50 =
  38. 38.Double 91 =
  39. 39.Double 28 =
  40. 40.Double 17 =

Answer key

  1. 96
  2. 134
  3. 44
  4. 43
  5. 66
  6. 87
  7. 104
  8. 54
  9. 42
  10. 162
  11. 67
  12. 23
  13. 63
  14. 13
  15. 48
  16. 102
  17. 78
  18. 20
  19. 82
  20. 86
  21. 18
  22. 124
  23. 39
  24. 190
  25. 55
  26. 27
  27. 144
  28. 70
  29. 178
  30. 136
  31. 114
  32. 91
  33. 54
  34. 30
  35. 90
  36. 74
  37. 25
  38. 182
  39. 56
  40. 34

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