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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 487 · 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 33 =
  2. 2.Double 88 =
  3. 3.Double 55 =
  4. 4.Double 47 =
  5. 5.Double 61 =
  6. 6.Double 34 =
  7. 7.Double 81 =
  8. 8.Double 32 =
  9. 9.Double 24 =
  10. 10.Double 53 =
  11. 11.Half of 56 =
  12. 12.Half of 52 =
  13. 13.Half of 130 =
  14. 14.Double 93 =
  15. 15.Half of 82 =
  16. 16.Half of 66 =
  17. 17.Half of 118 =
  18. 18.Half of 34 =
  19. 19.Half of 196 =
  20. 20.Half of 54 =
  21. 21.Double 85 =
  22. 22.Double 23 =
  23. 23.Half of 158 =
  24. 24.Double 21 =
  25. 25.Half of 172 =
  26. 26.Double 18 =
  27. 27.Half of 30 =
  28. 28.Double 63 =
  29. 29.Half of 194 =
  30. 30.Double 66 =
  31. 31.Double 59 =
  32. 32.Double 96 =
  33. 33.Double 16 =
  34. 34.Half of 70 =
  35. 35.Half of 32 =
  36. 36.Double 91 =
  37. 37.Half of 42 =
  38. 38.Double 45 =
  39. 39.Double 75 =
  40. 40.Half of 96 =

Answer key

  1. 66
  2. 176
  3. 110
  4. 94
  5. 122
  6. 68
  7. 162
  8. 64
  9. 48
  10. 106
  11. 28
  12. 26
  13. 65
  14. 186
  15. 41
  16. 33
  17. 59
  18. 17
  19. 98
  20. 27
  21. 170
  22. 46
  23. 79
  24. 42
  25. 86
  26. 36
  27. 15
  28. 126
  29. 97
  30. 132
  31. 118
  32. 192
  33. 32
  34. 35
  35. 16
  36. 182
  37. 21
  38. 90
  39. 150
  40. 48

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