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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 83 · 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 31 =
  2. 2.Double 18 =
  3. 3.Double 39 =
  4. 4.Double 55 =
  5. 5.Double 76 =
  6. 6.Half of 198 =
  7. 7.Half of 136 =
  8. 8.Half of 160 =
  9. 9.Double 73 =
  10. 10.Half of 86 =
  11. 11.Half of 108 =
  12. 12.Half of 84 =
  13. 13.Half of 74 =
  14. 14.Double 51 =
  15. 15.Double 44 =
  16. 16.Double 26 =
  17. 17.Double 25 =
  18. 18.Half of 130 =
  19. 19.Half of 156 =
  20. 20.Half of 102 =
  21. 21.Double 53 =
  22. 22.Double 42 =
  23. 23.Half of 164 =
  24. 24.Half of 40 =
  25. 25.Double 57 =
  26. 26.Double 47 =
  27. 27.Half of 170 =
  28. 28.Double 22 =
  29. 29.Double 94 =
  30. 30.Half of 152 =
  31. 31.Half of 176 =
  32. 32.Double 29 =
  33. 33.Double 91 =
  34. 34.Double 77 =
  35. 35.Half of 192 =
  36. 36.Double 95 =
  37. 37.Double 24 =
  38. 38.Double 21 =
  39. 39.Half of 26 =
  40. 40.Half of 52 =

Answer key

  1. 62
  2. 36
  3. 78
  4. 110
  5. 152
  6. 99
  7. 68
  8. 80
  9. 146
  10. 43
  11. 54
  12. 42
  13. 37
  14. 102
  15. 88
  16. 52
  17. 50
  18. 65
  19. 78
  20. 51
  21. 106
  22. 84
  23. 82
  24. 20
  25. 114
  26. 94
  27. 85
  28. 44
  29. 188
  30. 76
  31. 88
  32. 58
  33. 182
  34. 154
  35. 96
  36. 190
  37. 48
  38. 42
  39. 13
  40. 26

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