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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 146 · 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 26 =
  2. 2.Half of 116 =
  3. 3.Double 19 =
  4. 4.Double 24 =
  5. 5.Double 42 =
  6. 6.Double 41 =
  7. 7.Half of 100 =
  8. 8.Half of 84 =
  9. 9.Half of 94 =
  10. 10.Half of 104 =
  11. 11.Half of 114 =
  12. 12.Double 97 =
  13. 13.Double 32 =
  14. 14.Half of 106 =
  15. 15.Double 44 =
  16. 16.Half of 64 =
  17. 17.Half of 128 =
  18. 18.Half of 68 =
  19. 19.Double 76 =
  20. 20.Half of 184 =
  21. 21.Half of 102 =
  22. 22.Half of 146 =
  23. 23.Half of 40 =
  24. 24.Half of 176 =
  25. 25.Half of 170 =
  26. 26.Double 58 =
  27. 27.Double 47 =
  28. 28.Double 35 =
  29. 29.Double 31 =
  30. 30.Half of 36 =
  31. 31.Double 91 =
  32. 32.Double 39 =
  33. 33.Half of 62 =
  34. 34.Half of 50 =
  35. 35.Half of 42 =
  36. 36.Double 23 =
  37. 37.Double 72 =
  38. 38.Double 73 =
  39. 39.Double 52 =
  40. 40.Half of 118 =

Answer key

  1. 52
  2. 58
  3. 38
  4. 48
  5. 84
  6. 82
  7. 50
  8. 42
  9. 47
  10. 52
  11. 57
  12. 194
  13. 64
  14. 53
  15. 88
  16. 32
  17. 64
  18. 34
  19. 152
  20. 92
  21. 51
  22. 73
  23. 20
  24. 88
  25. 85
  26. 116
  27. 94
  28. 70
  29. 62
  30. 18
  31. 182
  32. 78
  33. 31
  34. 25
  35. 21
  36. 46
  37. 144
  38. 146
  39. 104
  40. 59

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