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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 207 · 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 148 =
  2. 2.Half of 28 =
  3. 3.Double 34 =
  4. 4.Half of 168 =
  5. 5.Double 22 =
  6. 6.Half of 90 =
  7. 7.Half of 46 =
  8. 8.Half of 170 =
  9. 9.Double 82 =
  10. 10.Double 99 =
  11. 11.Double 55 =
  12. 12.Double 63 =
  13. 13.Half of 186 =
  14. 14.Double 45 =
  15. 15.Double 21 =
  16. 16.Double 16 =
  17. 17.Half of 64 =
  18. 18.Double 98 =
  19. 19.Double 42 =
  20. 20.Half of 88 =
  21. 21.Double 18 =
  22. 22.Double 33 =
  23. 23.Half of 166 =
  24. 24.Half of 42 =
  25. 25.Double 61 =
  26. 26.Double 72 =
  27. 27.Double 17 =
  28. 28.Double 74 =
  29. 29.Double 64 =
  30. 30.Half of 112 =
  31. 31.Half of 176 =
  32. 32.Half of 44 =
  33. 33.Half of 54 =
  34. 34.Double 91 =
  35. 35.Half of 60 =
  36. 36.Double 69 =
  37. 37.Half of 98 =
  38. 38.Double 28 =
  39. 39.Half of 180 =
  40. 40.Double 36 =

Answer key

  1. 74
  2. 14
  3. 68
  4. 84
  5. 44
  6. 45
  7. 23
  8. 85
  9. 164
  10. 198
  11. 110
  12. 126
  13. 93
  14. 90
  15. 42
  16. 32
  17. 32
  18. 196
  19. 84
  20. 44
  21. 36
  22. 66
  23. 83
  24. 21
  25. 122
  26. 144
  27. 34
  28. 148
  29. 128
  30. 56
  31. 88
  32. 22
  33. 27
  34. 182
  35. 30
  36. 138
  37. 49
  38. 56
  39. 90
  40. 72

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