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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 840 · 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 27 =
  2. 2.Double 22 =
  3. 3.Double 61 =
  4. 4.Half of 32 =
  5. 5.Half of 72 =
  6. 6.Double 98 =
  7. 7.Half of 68 =
  8. 8.Half of 34 =
  9. 9.Half of 88 =
  10. 10.Half of 30 =
  11. 11.Double 79 =
  12. 12.Half of 116 =
  13. 13.Half of 70 =
  14. 14.Double 87 =
  15. 15.Double 94 =
  16. 16.Double 26 =
  17. 17.Double 19 =
  18. 18.Double 81 =
  19. 19.Double 25 =
  20. 20.Half of 54 =
  21. 21.Half of 122 =
  22. 22.Half of 36 =
  23. 23.Half of 146 =
  24. 24.Double 46 =
  25. 25.Double 29 =
  26. 26.Half of 38 =
  27. 27.Half of 130 =
  28. 28.Double 47 =
  29. 29.Half of 148 =
  30. 30.Half of 60 =
  31. 31.Half of 90 =
  32. 32.Half of 196 =
  33. 33.Double 45 =
  34. 34.Half of 46 =
  35. 35.Double 34 =
  36. 36.Half of 66 =
  37. 37.Half of 190 =
  38. 38.Double 66 =
  39. 39.Half of 162 =
  40. 40.Double 41 =

Answer key

  1. 54
  2. 44
  3. 122
  4. 16
  5. 36
  6. 196
  7. 34
  8. 17
  9. 44
  10. 15
  11. 158
  12. 58
  13. 35
  14. 174
  15. 188
  16. 52
  17. 38
  18. 162
  19. 50
  20. 27
  21. 61
  22. 18
  23. 73
  24. 92
  25. 58
  26. 19
  27. 65
  28. 94
  29. 74
  30. 30
  31. 45
  32. 98
  33. 90
  34. 23
  35. 68
  36. 33
  37. 95
  38. 132
  39. 81
  40. 82

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