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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 420 · 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 81 =
  2. 2.Half of 124 =
  3. 3.Double 39 =
  4. 4.Half of 180 =
  5. 5.Double 42 =
  6. 6.Double 36 =
  7. 7.Double 95 =
  8. 8.Half of 150 =
  9. 9.Half of 136 =
  10. 10.Double 61 =
  11. 11.Double 41 =
  12. 12.Double 19 =
  13. 13.Double 91 =
  14. 14.Half of 134 =
  15. 15.Double 65 =
  16. 16.Half of 38 =
  17. 17.Double 56 =
  18. 18.Double 51 =
  19. 19.Double 82 =
  20. 20.Double 23 =
  21. 21.Double 72 =
  22. 22.Double 74 =
  23. 23.Half of 174 =
  24. 24.Half of 40 =
  25. 25.Half of 48 =
  26. 26.Half of 46 =
  27. 27.Half of 94 =
  28. 28.Half of 74 =
  29. 29.Double 22 =
  30. 30.Half of 146 =
  31. 31.Double 37 =
  32. 32.Half of 34 =
  33. 33.Double 34 =
  34. 34.Half of 58 =
  35. 35.Double 16 =
  36. 36.Half of 54 =
  37. 37.Half of 56 =
  38. 38.Half of 72 =
  39. 39.Double 63 =
  40. 40.Half of 92 =

Answer key

  1. 162
  2. 62
  3. 78
  4. 90
  5. 84
  6. 72
  7. 190
  8. 75
  9. 68
  10. 122
  11. 82
  12. 38
  13. 182
  14. 67
  15. 130
  16. 19
  17. 112
  18. 102
  19. 164
  20. 46
  21. 144
  22. 148
  23. 87
  24. 20
  25. 24
  26. 23
  27. 47
  28. 37
  29. 44
  30. 73
  31. 74
  32. 17
  33. 68
  34. 29
  35. 32
  36. 27
  37. 28
  38. 36
  39. 126
  40. 46

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