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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 239 · 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 17 =
  2. 2.Half of 40 =
  3. 3.Double 37 =
  4. 4.Half of 82 =
  5. 5.Double 31 =
  6. 6.Half of 148 =
  7. 7.Double 39 =
  8. 8.Double 85 =
  9. 9.Double 24 =
  10. 10.Double 98 =
  11. 11.Half of 46 =
  12. 12.Double 44 =
  13. 13.Double 51 =
  14. 14.Half of 178 =
  15. 15.Half of 150 =
  16. 16.Double 48 =
  17. 17.Double 79 =
  18. 18.Double 22 =
  19. 19.Double 36 =
  20. 20.Double 26 =
  21. 21.Half of 164 =
  22. 22.Half of 96 =
  23. 23.Double 69 =
  24. 24.Half of 76 =
  25. 25.Half of 118 =
  26. 26.Half of 184 =
  27. 27.Half of 84 =
  28. 28.Half of 26 =
  29. 29.Double 93 =
  30. 30.Double 29 =
  31. 31.Half of 112 =
  32. 32.Half of 78 =
  33. 33.Double 97 =
  34. 34.Half of 34 =
  35. 35.Half of 122 =
  36. 36.Half of 48 =
  37. 37.Double 42 =
  38. 38.Double 53 =
  39. 39.Double 76 =
  40. 40.Half of 50 =

Answer key

  1. 34
  2. 20
  3. 74
  4. 41
  5. 62
  6. 74
  7. 78
  8. 170
  9. 48
  10. 196
  11. 23
  12. 88
  13. 102
  14. 89
  15. 75
  16. 96
  17. 158
  18. 44
  19. 72
  20. 52
  21. 82
  22. 48
  23. 138
  24. 38
  25. 59
  26. 92
  27. 42
  28. 13
  29. 186
  30. 58
  31. 56
  32. 39
  33. 194
  34. 17
  35. 61
  36. 24
  37. 84
  38. 106
  39. 152
  40. 25

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