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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 614 · 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 134 =
  2. 2.Double 82 =
  3. 3.Half of 26 =
  4. 4.Double 18 =
  5. 5.Half of 68 =
  6. 6.Half of 122 =
  7. 7.Half of 170 =
  8. 8.Double 74 =
  9. 9.Half of 54 =
  10. 10.Half of 76 =
  11. 11.Half of 30 =
  12. 12.Half of 46 =
  13. 13.Half of 98 =
  14. 14.Double 96 =
  15. 15.Half of 42 =
  16. 16.Half of 74 =
  17. 17.Double 71 =
  18. 18.Double 23 =
  19. 19.Double 54 =
  20. 20.Double 57 =
  21. 21.Double 59 =
  22. 22.Half of 90 =
  23. 23.Double 34 =
  24. 24.Half of 52 =
  25. 25.Double 62 =
  26. 26.Half of 56 =
  27. 27.Half of 198 =
  28. 28.Double 72 =
  29. 29.Half of 132 =
  30. 30.Half of 110 =
  31. 31.Half of 138 =
  32. 32.Double 69 =
  33. 33.Double 66 =
  34. 34.Half of 124 =
  35. 35.Half of 44 =
  36. 36.Double 21 =
  37. 37.Double 43 =
  38. 38.Half of 28 =
  39. 39.Half of 40 =
  40. 40.Double 44 =

Answer key

  1. 67
  2. 164
  3. 13
  4. 36
  5. 34
  6. 61
  7. 85
  8. 148
  9. 27
  10. 38
  11. 15
  12. 23
  13. 49
  14. 192
  15. 21
  16. 37
  17. 142
  18. 46
  19. 108
  20. 114
  21. 118
  22. 45
  23. 68
  24. 26
  25. 124
  26. 28
  27. 99
  28. 144
  29. 66
  30. 55
  31. 69
  32. 138
  33. 132
  34. 62
  35. 22
  36. 42
  37. 86
  38. 14
  39. 20
  40. 88

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