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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 744 · 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 65 =
  2. 2.Double 39 =
  3. 3.Double 38 =
  4. 4.Half of 166 =
  5. 5.Double 51 =
  6. 6.Double 46 =
  7. 7.Half of 164 =
  8. 8.Half of 148 =
  9. 9.Double 68 =
  10. 10.Half of 42 =
  11. 11.Half of 80 =
  12. 12.Half of 134 =
  13. 13.Half of 104 =
  14. 14.Half of 28 =
  15. 15.Double 88 =
  16. 16.Double 67 =
  17. 17.Double 87 =
  18. 18.Half of 74 =
  19. 19.Half of 156 =
  20. 20.Half of 68 =
  21. 21.Double 25 =
  22. 22.Double 73 =
  23. 23.Half of 126 =
  24. 24.Double 45 =
  25. 25.Half of 76 =
  26. 26.Double 49 =
  27. 27.Double 42 =
  28. 28.Double 19 =
  29. 29.Half of 70 =
  30. 30.Half of 168 =
  31. 31.Double 43 =
  32. 32.Half of 120 =
  33. 33.Half of 136 =
  34. 34.Half of 50 =
  35. 35.Double 31 =
  36. 36.Half of 52 =
  37. 37.Double 58 =
  38. 38.Double 21 =
  39. 39.Double 28 =
  40. 40.Double 64 =

Answer key

  1. 130
  2. 78
  3. 76
  4. 83
  5. 102
  6. 92
  7. 82
  8. 74
  9. 136
  10. 21
  11. 40
  12. 67
  13. 52
  14. 14
  15. 176
  16. 134
  17. 174
  18. 37
  19. 78
  20. 34
  21. 50
  22. 146
  23. 63
  24. 90
  25. 38
  26. 98
  27. 84
  28. 38
  29. 35
  30. 84
  31. 86
  32. 60
  33. 68
  34. 25
  35. 62
  36. 26
  37. 116
  38. 42
  39. 56
  40. 128

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