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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 668 · 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 152 =
  2. 2.Double 56 =
  3. 3.Half of 84 =
  4. 4.Double 31 =
  5. 5.Double 47 =
  6. 6.Double 63 =
  7. 7.Double 82 =
  8. 8.Double 41 =
  9. 9.Half of 198 =
  10. 10.Double 81 =
  11. 11.Half of 96 =
  12. 12.Double 25 =
  13. 13.Half of 192 =
  14. 14.Double 43 =
  15. 15.Double 28 =
  16. 16.Double 92 =
  17. 17.Half of 98 =
  18. 18.Half of 64 =
  19. 19.Double 49 =
  20. 20.Half of 34 =
  21. 21.Half of 130 =
  22. 22.Half of 30 =
  23. 23.Double 46 =
  24. 24.Double 93 =
  25. 25.Half of 38 =
  26. 26.Double 22 =
  27. 27.Half of 176 =
  28. 28.Double 78 =
  29. 29.Double 21 =
  30. 30.Half of 154 =
  31. 31.Double 32 =
  32. 32.Half of 42 =
  33. 33.Double 69 =
  34. 34.Half of 148 =
  35. 35.Half of 106 =
  36. 36.Half of 56 =
  37. 37.Half of 88 =
  38. 38.Half of 168 =
  39. 39.Half of 110 =
  40. 40.Half of 28 =

Answer key

  1. 76
  2. 112
  3. 42
  4. 62
  5. 94
  6. 126
  7. 164
  8. 82
  9. 99
  10. 162
  11. 48
  12. 50
  13. 96
  14. 86
  15. 56
  16. 184
  17. 49
  18. 32
  19. 98
  20. 17
  21. 65
  22. 15
  23. 92
  24. 186
  25. 19
  26. 44
  27. 88
  28. 156
  29. 42
  30. 77
  31. 64
  32. 21
  33. 138
  34. 74
  35. 53
  36. 28
  37. 44
  38. 84
  39. 55
  40. 14

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