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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 7 · 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 176 =
  2. 2.Double 16 =
  3. 3.Double 76 =
  4. 4.Double 41 =
  5. 5.Half of 124 =
  6. 6.Half of 80 =
  7. 7.Double 91 =
  8. 8.Half of 92 =
  9. 9.Half of 150 =
  10. 10.Half of 152 =
  11. 11.Double 57 =
  12. 12.Half of 166 =
  13. 13.Double 84 =
  14. 14.Half of 140 =
  15. 15.Half of 46 =
  16. 16.Double 97 =
  17. 17.Half of 40 =
  18. 18.Double 28 =
  19. 19.Double 34 =
  20. 20.Double 23 =
  21. 21.Half of 108 =
  22. 22.Double 53 =
  23. 23.Double 49 =
  24. 24.Double 65 =
  25. 25.Half of 114 =
  26. 26.Double 31 =
  27. 27.Half of 36 =
  28. 28.Double 48 =
  29. 29.Double 82 =
  30. 30.Half of 70 =
  31. 31.Half of 78 =
  32. 32.Half of 72 =
  33. 33.Double 45 =
  34. 34.Double 22 =
  35. 35.Half of 34 =
  36. 36.Double 94 =
  37. 37.Double 39 =
  38. 38.Half of 174 =
  39. 39.Double 33 =
  40. 40.Double 79 =

Answer key

  1. 88
  2. 32
  3. 152
  4. 82
  5. 62
  6. 40
  7. 182
  8. 46
  9. 75
  10. 76
  11. 114
  12. 83
  13. 168
  14. 70
  15. 23
  16. 194
  17. 20
  18. 56
  19. 68
  20. 46
  21. 54
  22. 106
  23. 98
  24. 130
  25. 57
  26. 62
  27. 18
  28. 96
  29. 164
  30. 35
  31. 39
  32. 36
  33. 90
  34. 44
  35. 17
  36. 188
  37. 78
  38. 87
  39. 66
  40. 158

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