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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 473 · 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 118 =
  2. 2.Double 32 =
  3. 3.Double 18 =
  4. 4.Double 33 =
  5. 5.Double 39 =
  6. 6.Double 59 =
  7. 7.Half of 38 =
  8. 8.Half of 120 =
  9. 9.Double 81 =
  10. 10.Double 43 =
  11. 11.Double 31 =
  12. 12.Half of 178 =
  13. 13.Half of 68 =
  14. 14.Double 55 =
  15. 15.Double 68 =
  16. 16.Double 98 =
  17. 17.Double 48 =
  18. 18.Half of 188 =
  19. 19.Half of 158 =
  20. 20.Double 17 =
  21. 21.Double 45 =
  22. 22.Half of 104 =
  23. 23.Half of 128 =
  24. 24.Double 16 =
  25. 25.Half of 36 =
  26. 26.Double 52 =
  27. 27.Half of 166 =
  28. 28.Double 47 =
  29. 29.Half of 72 =
  30. 30.Half of 138 =
  31. 31.Double 24 =
  32. 32.Half of 90 =
  33. 33.Double 67 =
  34. 34.Double 62 =
  35. 35.Double 35 =
  36. 36.Double 58 =
  37. 37.Double 36 =
  38. 38.Half of 148 =
  39. 39.Half of 130 =
  40. 40.Half of 48 =

Answer key

  1. 59
  2. 64
  3. 36
  4. 66
  5. 78
  6. 118
  7. 19
  8. 60
  9. 162
  10. 86
  11. 62
  12. 89
  13. 34
  14. 110
  15. 136
  16. 196
  17. 96
  18. 94
  19. 79
  20. 34
  21. 90
  22. 52
  23. 64
  24. 32
  25. 18
  26. 104
  27. 83
  28. 94
  29. 36
  30. 69
  31. 48
  32. 45
  33. 134
  34. 124
  35. 70
  36. 116
  37. 72
  38. 74
  39. 65
  40. 24

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