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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 570 · 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 60 =
  2. 2.Double 59 =
  3. 3.Double 48 =
  4. 4.Double 34 =
  5. 5.Half of 162 =
  6. 6.Double 39 =
  7. 7.Half of 182 =
  8. 8.Double 67 =
  9. 9.Half of 198 =
  10. 10.Double 16 =
  11. 11.Double 85 =
  12. 12.Half of 102 =
  13. 13.Double 83 =
  14. 14.Double 86 =
  15. 15.Half of 46 =
  16. 16.Double 22 =
  17. 17.Half of 40 =
  18. 18.Double 95 =
  19. 19.Half of 186 =
  20. 20.Half of 54 =
  21. 21.Half of 92 =
  22. 22.Half of 74 =
  23. 23.Half of 70 =
  24. 24.Half of 32 =
  25. 25.Double 66 =
  26. 26.Half of 118 =
  27. 27.Double 77 =
  28. 28.Half of 166 =
  29. 29.Double 41 =
  30. 30.Double 19 =
  31. 31.Half of 58 =
  32. 32.Half of 44 =
  33. 33.Half of 192 =
  34. 34.Double 28 =
  35. 35.Half of 38 =
  36. 36.Half of 146 =
  37. 37.Double 63 =
  38. 38.Double 18 =
  39. 39.Double 21 =
  40. 40.Half of 94 =

Answer key

  1. 30
  2. 118
  3. 96
  4. 68
  5. 81
  6. 78
  7. 91
  8. 134
  9. 99
  10. 32
  11. 170
  12. 51
  13. 166
  14. 172
  15. 23
  16. 44
  17. 20
  18. 190
  19. 93
  20. 27
  21. 46
  22. 37
  23. 35
  24. 16
  25. 132
  26. 59
  27. 154
  28. 83
  29. 82
  30. 38
  31. 29
  32. 22
  33. 96
  34. 56
  35. 19
  36. 73
  37. 126
  38. 36
  39. 42
  40. 47

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