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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 377 · 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 48 =
  2. 2.Double 63 =
  3. 3.Double 54 =
  4. 4.Double 16 =
  5. 5.Half of 104 =
  6. 6.Double 81 =
  7. 7.Half of 78 =
  8. 8.Double 74 =
  9. 9.Double 67 =
  10. 10.Half of 90 =
  11. 11.Half of 124 =
  12. 12.Half of 170 =
  13. 13.Double 64 =
  14. 14.Half of 140 =
  15. 15.Half of 122 =
  16. 16.Double 53 =
  17. 17.Half of 192 =
  18. 18.Half of 52 =
  19. 19.Double 24 =
  20. 20.Double 76 =
  21. 21.Half of 136 =
  22. 22.Double 88 =
  23. 23.Double 83 =
  24. 24.Double 21 =
  25. 25.Double 49 =
  26. 26.Half of 40 =
  27. 27.Half of 26 =
  28. 28.Half of 34 =
  29. 29.Double 32 =
  30. 30.Half of 50 =
  31. 31.Double 71 =
  32. 32.Double 27 =
  33. 33.Half of 132 =
  34. 34.Half of 30 =
  35. 35.Half of 58 =
  36. 36.Double 69 =
  37. 37.Double 87 =
  38. 38.Half of 38 =
  39. 39.Half of 172 =
  40. 40.Double 84 =

Answer key

  1. 96
  2. 126
  3. 108
  4. 32
  5. 52
  6. 162
  7. 39
  8. 148
  9. 134
  10. 45
  11. 62
  12. 85
  13. 128
  14. 70
  15. 61
  16. 106
  17. 96
  18. 26
  19. 48
  20. 152
  21. 68
  22. 176
  23. 166
  24. 42
  25. 98
  26. 20
  27. 13
  28. 17
  29. 64
  30. 25
  31. 142
  32. 54
  33. 66
  34. 15
  35. 29
  36. 138
  37. 174
  38. 19
  39. 86
  40. 168

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