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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 221 · 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 34 =
  2. 2.Half of 72 =
  3. 3.Double 25 =
  4. 4.Double 16 =
  5. 5.Half of 32 =
  6. 6.Half of 42 =
  7. 7.Half of 138 =
  8. 8.Half of 64 =
  9. 9.Half of 54 =
  10. 10.Half of 48 =
  11. 11.Double 23 =
  12. 12.Double 39 =
  13. 13.Double 75 =
  14. 14.Half of 80 =
  15. 15.Double 31 =
  16. 16.Half of 68 =
  17. 17.Half of 66 =
  18. 18.Double 81 =
  19. 19.Half of 188 =
  20. 20.Double 51 =
  21. 21.Double 93 =
  22. 22.Double 35 =
  23. 23.Double 43 =
  24. 24.Half of 130 =
  25. 25.Double 97 =
  26. 26.Half of 122 =
  27. 27.Double 58 =
  28. 28.Half of 60 =
  29. 29.Half of 108 =
  30. 30.Half of 104 =
  31. 31.Half of 44 =
  32. 32.Double 88 =
  33. 33.Double 94 =
  34. 34.Double 86 =
  35. 35.Double 55 =
  36. 36.Double 87 =
  37. 37.Double 62 =
  38. 38.Double 44 =
  39. 39.Half of 50 =
  40. 40.Double 27 =

Answer key

  1. 17
  2. 36
  3. 50
  4. 32
  5. 16
  6. 21
  7. 69
  8. 32
  9. 27
  10. 24
  11. 46
  12. 78
  13. 150
  14. 40
  15. 62
  16. 34
  17. 33
  18. 162
  19. 94
  20. 102
  21. 186
  22. 70
  23. 86
  24. 65
  25. 194
  26. 61
  27. 116
  28. 30
  29. 54
  30. 52
  31. 22
  32. 176
  33. 188
  34. 172
  35. 110
  36. 174
  37. 124
  38. 88
  39. 25
  40. 54

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