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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 463 · 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 72 =
  2. 2.Double 35 =
  3. 3.Half of 32 =
  4. 4.Double 99 =
  5. 5.Half of 48 =
  6. 6.Double 25 =
  7. 7.Half of 134 =
  8. 8.Double 75 =
  9. 9.Double 43 =
  10. 10.Half of 198 =
  11. 11.Half of 122 =
  12. 12.Double 21 =
  13. 13.Double 16 =
  14. 14.Double 27 =
  15. 15.Half of 174 =
  16. 16.Double 37 =
  17. 17.Double 89 =
  18. 18.Double 73 =
  19. 19.Half of 94 =
  20. 20.Half of 164 =
  21. 21.Double 41 =
  22. 22.Double 24 =
  23. 23.Half of 186 =
  24. 24.Double 19 =
  25. 25.Double 48 =
  26. 26.Double 17 =
  27. 27.Double 18 =
  28. 28.Half of 154 =
  29. 29.Double 95 =
  30. 30.Half of 30 =
  31. 31.Half of 192 =
  32. 32.Half of 128 =
  33. 33.Half of 86 =
  34. 34.Half of 184 =
  35. 35.Half of 120 =
  36. 36.Half of 50 =
  37. 37.Half of 102 =
  38. 38.Double 91 =
  39. 39.Double 34 =
  40. 40.Half of 166 =

Answer key

  1. 144
  2. 70
  3. 16
  4. 198
  5. 24
  6. 50
  7. 67
  8. 150
  9. 86
  10. 99
  11. 61
  12. 42
  13. 32
  14. 54
  15. 87
  16. 74
  17. 178
  18. 146
  19. 47
  20. 82
  21. 82
  22. 48
  23. 93
  24. 38
  25. 96
  26. 34
  27. 36
  28. 77
  29. 190
  30. 15
  31. 96
  32. 64
  33. 43
  34. 92
  35. 60
  36. 25
  37. 51
  38. 182
  39. 68
  40. 83

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