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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 345 · 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 73 =
  2. 2.Half of 46 =
  3. 3.Double 85 =
  4. 4.Double 92 =
  5. 5.Double 56 =
  6. 6.Half of 144 =
  7. 7.Double 98 =
  8. 8.Double 69 =
  9. 9.Double 44 =
  10. 10.Half of 38 =
  11. 11.Half of 56 =
  12. 12.Double 25 =
  13. 13.Half of 44 =
  14. 14.Double 31 =
  15. 15.Double 55 =
  16. 16.Half of 114 =
  17. 17.Half of 194 =
  18. 18.Half of 86 =
  19. 19.Double 83 =
  20. 20.Half of 72 =
  21. 21.Double 74 =
  22. 22.Double 18 =
  23. 23.Double 89 =
  24. 24.Double 21 =
  25. 25.Double 48 =
  26. 26.Half of 88 =
  27. 27.Half of 98 =
  28. 28.Double 51 =
  29. 29.Double 41 =
  30. 30.Half of 132 =
  31. 31.Half of 90 =
  32. 32.Half of 58 =
  33. 33.Double 91 =
  34. 34.Double 75 =
  35. 35.Half of 180 =
  36. 36.Half of 174 =
  37. 37.Double 47 =
  38. 38.Double 97 =
  39. 39.Half of 54 =
  40. 40.Double 34 =

Answer key

  1. 146
  2. 23
  3. 170
  4. 184
  5. 112
  6. 72
  7. 196
  8. 138
  9. 88
  10. 19
  11. 28
  12. 50
  13. 22
  14. 62
  15. 110
  16. 57
  17. 97
  18. 43
  19. 166
  20. 36
  21. 148
  22. 36
  23. 178
  24. 42
  25. 96
  26. 44
  27. 49
  28. 102
  29. 82
  30. 66
  31. 45
  32. 29
  33. 182
  34. 150
  35. 90
  36. 87
  37. 94
  38. 194
  39. 27
  40. 68

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