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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 177 · 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 38 =
  2. 2.Double 47 =
  3. 3.Double 53 =
  4. 4.Half of 62 =
  5. 5.Double 45 =
  6. 6.Double 24 =
  7. 7.Double 72 =
  8. 8.Half of 34 =
  9. 9.Double 17 =
  10. 10.Double 98 =
  11. 11.Half of 194 =
  12. 12.Double 65 =
  13. 13.Half of 188 =
  14. 14.Double 39 =
  15. 15.Half of 130 =
  16. 16.Double 91 =
  17. 17.Double 78 =
  18. 18.Double 85 =
  19. 19.Double 73 =
  20. 20.Half of 66 =
  21. 21.Half of 52 =
  22. 22.Double 31 =
  23. 23.Double 26 =
  24. 24.Half of 176 =
  25. 25.Double 42 =
  26. 26.Half of 86 =
  27. 27.Double 87 =
  28. 28.Double 75 =
  29. 29.Half of 70 =
  30. 30.Half of 46 =
  31. 31.Half of 132 =
  32. 32.Double 59 =
  33. 33.Double 83 =
  34. 34.Double 71 =
  35. 35.Half of 174 =
  36. 36.Half of 26 =
  37. 37.Half of 156 =
  38. 38.Double 84 =
  39. 39.Double 28 =
  40. 40.Double 96 =

Answer key

  1. 76
  2. 94
  3. 106
  4. 31
  5. 90
  6. 48
  7. 144
  8. 17
  9. 34
  10. 196
  11. 97
  12. 130
  13. 94
  14. 78
  15. 65
  16. 182
  17. 156
  18. 170
  19. 146
  20. 33
  21. 26
  22. 62
  23. 52
  24. 88
  25. 84
  26. 43
  27. 174
  28. 150
  29. 35
  30. 23
  31. 66
  32. 118
  33. 166
  34. 142
  35. 87
  36. 13
  37. 78
  38. 168
  39. 56
  40. 192

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