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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 545 · 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 36 =
  2. 2.Double 95 =
  3. 3.Double 38 =
  4. 4.Half of 148 =
  5. 5.Double 27 =
  6. 6.Double 47 =
  7. 7.Double 23 =
  8. 8.Double 34 =
  9. 9.Double 24 =
  10. 10.Double 41 =
  11. 11.Double 86 =
  12. 12.Double 62 =
  13. 13.Half of 130 =
  14. 14.Half of 174 =
  15. 15.Half of 134 =
  16. 16.Double 51 =
  17. 17.Half of 46 =
  18. 18.Double 71 =
  19. 19.Double 32 =
  20. 20.Double 21 =
  21. 21.Double 44 =
  22. 22.Half of 70 =
  23. 23.Half of 196 =
  24. 24.Half of 120 =
  25. 25.Half of 34 =
  26. 26.Double 36 =
  27. 27.Half of 152 =
  28. 28.Half of 84 =
  29. 29.Half of 102 =
  30. 30.Double 35 =
  31. 31.Double 18 =
  32. 32.Double 37 =
  33. 33.Half of 106 =
  34. 34.Half of 172 =
  35. 35.Double 33 =
  36. 36.Double 64 =
  37. 37.Half of 182 =
  38. 38.Half of 96 =
  39. 39.Double 17 =
  40. 40.Half of 68 =

Answer key

  1. 18
  2. 190
  3. 76
  4. 74
  5. 54
  6. 94
  7. 46
  8. 68
  9. 48
  10. 82
  11. 172
  12. 124
  13. 65
  14. 87
  15. 67
  16. 102
  17. 23
  18. 142
  19. 64
  20. 42
  21. 88
  22. 35
  23. 98
  24. 60
  25. 17
  26. 72
  27. 76
  28. 42
  29. 51
  30. 70
  31. 36
  32. 74
  33. 53
  34. 86
  35. 66
  36. 128
  37. 91
  38. 48
  39. 34
  40. 34

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