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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 309 · 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 156 =
  2. 2.Double 31 =
  3. 3.Half of 46 =
  4. 4.Half of 112 =
  5. 5.Half of 100 =
  6. 6.Double 89 =
  7. 7.Half of 170 =
  8. 8.Double 27 =
  9. 9.Half of 178 =
  10. 10.Half of 54 =
  11. 11.Double 78 =
  12. 12.Half of 64 =
  13. 13.Half of 90 =
  14. 14.Double 58 =
  15. 15.Half of 76 =
  16. 16.Half of 166 =
  17. 17.Double 45 =
  18. 18.Half of 148 =
  19. 19.Half of 126 =
  20. 20.Half of 168 =
  21. 21.Double 18 =
  22. 22.Double 28 =
  23. 23.Double 49 =
  24. 24.Half of 128 =
  25. 25.Double 35 =
  26. 26.Half of 144 =
  27. 27.Half of 66 =
  28. 28.Half of 30 =
  29. 29.Double 63 =
  30. 30.Half of 132 =
  31. 31.Half of 150 =
  32. 32.Double 95 =
  33. 33.Double 67 =
  34. 34.Double 61 =
  35. 35.Double 72 =
  36. 36.Half of 74 =
  37. 37.Half of 58 =
  38. 38.Double 39 =
  39. 39.Half of 180 =
  40. 40.Double 73 =

Answer key

  1. 78
  2. 62
  3. 23
  4. 56
  5. 50
  6. 178
  7. 85
  8. 54
  9. 89
  10. 27
  11. 156
  12. 32
  13. 45
  14. 116
  15. 38
  16. 83
  17. 90
  18. 74
  19. 63
  20. 84
  21. 36
  22. 56
  23. 98
  24. 64
  25. 70
  26. 72
  27. 33
  28. 15
  29. 126
  30. 66
  31. 75
  32. 190
  33. 134
  34. 122
  35. 144
  36. 37
  37. 29
  38. 78
  39. 90
  40. 146

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