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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 813 · 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 22 =
  2. 2.Half of 80 =
  3. 3.Double 57 =
  4. 4.Half of 88 =
  5. 5.Half of 44 =
  6. 6.Double 35 =
  7. 7.Half of 172 =
  8. 8.Double 67 =
  9. 9.Double 24 =
  10. 10.Half of 56 =
  11. 11.Double 78 =
  12. 12.Half of 86 =
  13. 13.Double 31 =
  14. 14.Half of 42 =
  15. 15.Half of 64 =
  16. 16.Double 26 =
  17. 17.Half of 180 =
  18. 18.Half of 100 =
  19. 19.Double 44 =
  20. 20.Half of 156 =
  21. 21.Double 98 =
  22. 22.Double 27 =
  23. 23.Half of 142 =
  24. 24.Half of 38 =
  25. 25.Double 99 =
  26. 26.Double 69 =
  27. 27.Half of 28 =
  28. 28.Double 74 =
  29. 29.Double 63 =
  30. 30.Half of 60 =
  31. 31.Half of 114 =
  32. 32.Half of 138 =
  33. 33.Double 55 =
  34. 34.Double 18 =
  35. 35.Half of 32 =
  36. 36.Half of 158 =
  37. 37.Double 43 =
  38. 38.Double 29 =
  39. 39.Double 21 =
  40. 40.Double 61 =

Answer key

  1. 44
  2. 40
  3. 114
  4. 44
  5. 22
  6. 70
  7. 86
  8. 134
  9. 48
  10. 28
  11. 156
  12. 43
  13. 62
  14. 21
  15. 32
  16. 52
  17. 90
  18. 50
  19. 88
  20. 78
  21. 196
  22. 54
  23. 71
  24. 19
  25. 198
  26. 138
  27. 14
  28. 148
  29. 126
  30. 30
  31. 57
  32. 69
  33. 110
  34. 36
  35. 16
  36. 79
  37. 86
  38. 58
  39. 42
  40. 122

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