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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 785 · 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 37 =
  2. 2.Double 34 =
  3. 3.Half of 96 =
  4. 4.Half of 148 =
  5. 5.Double 41 =
  6. 6.Double 51 =
  7. 7.Half of 130 =
  8. 8.Half of 180 =
  9. 9.Double 62 =
  10. 10.Double 18 =
  11. 11.Double 52 =
  12. 12.Half of 170 =
  13. 13.Double 92 =
  14. 14.Half of 152 =
  15. 15.Double 76 =
  16. 16.Half of 172 =
  17. 17.Half of 114 =
  18. 18.Double 25 =
  19. 19.Half of 38 =
  20. 20.Double 91 =
  21. 21.Double 47 =
  22. 22.Half of 166 =
  23. 23.Half of 30 =
  24. 24.Half of 134 =
  25. 25.Double 63 =
  26. 26.Double 42 =
  27. 27.Half of 44 =
  28. 28.Double 46 =
  29. 29.Double 81 =
  30. 30.Half of 90 =
  31. 31.Half of 68 =
  32. 32.Half of 98 =
  33. 33.Half of 72 =
  34. 34.Double 71 =
  35. 35.Half of 124 =
  36. 36.Half of 60 =
  37. 37.Double 36 =
  38. 38.Double 45 =
  39. 39.Half of 174 =
  40. 40.Half of 62 =

Answer key

  1. 74
  2. 68
  3. 48
  4. 74
  5. 82
  6. 102
  7. 65
  8. 90
  9. 124
  10. 36
  11. 104
  12. 85
  13. 184
  14. 76
  15. 152
  16. 86
  17. 57
  18. 50
  19. 19
  20. 182
  21. 94
  22. 83
  23. 15
  24. 67
  25. 126
  26. 84
  27. 22
  28. 92
  29. 162
  30. 45
  31. 34
  32. 49
  33. 36
  34. 142
  35. 62
  36. 30
  37. 72
  38. 90
  39. 87
  40. 31

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