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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 697 · 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 24 =
  2. 2.Half of 176 =
  3. 3.Double 43 =
  4. 4.Half of 148 =
  5. 5.Double 34 =
  6. 6.Double 84 =
  7. 7.Double 22 =
  8. 8.Double 91 =
  9. 9.Half of 70 =
  10. 10.Half of 46 =
  11. 11.Half of 124 =
  12. 12.Double 95 =
  13. 13.Double 94 =
  14. 14.Double 37 =
  15. 15.Half of 96 =
  16. 16.Half of 142 =
  17. 17.Half of 100 =
  18. 18.Half of 64 =
  19. 19.Half of 72 =
  20. 20.Half of 150 =
  21. 21.Half of 114 =
  22. 22.Half of 198 =
  23. 23.Half of 180 =
  24. 24.Half of 50 =
  25. 25.Double 51 =
  26. 26.Double 16 =
  27. 27.Double 39 =
  28. 28.Half of 120 =
  29. 29.Half of 92 =
  30. 30.Half of 36 =
  31. 31.Double 17 =
  32. 32.Double 52 =
  33. 33.Half of 44 =
  34. 34.Half of 116 =
  35. 35.Double 33 =
  36. 36.Double 25 =
  37. 37.Half of 126 =
  38. 38.Double 23 =
  39. 39.Double 21 =
  40. 40.Half of 56 =

Answer key

  1. 48
  2. 88
  3. 86
  4. 74
  5. 68
  6. 168
  7. 44
  8. 182
  9. 35
  10. 23
  11. 62
  12. 190
  13. 188
  14. 74
  15. 48
  16. 71
  17. 50
  18. 32
  19. 36
  20. 75
  21. 57
  22. 99
  23. 90
  24. 25
  25. 102
  26. 32
  27. 78
  28. 60
  29. 46
  30. 18
  31. 34
  32. 104
  33. 22
  34. 58
  35. 66
  36. 50
  37. 63
  38. 46
  39. 42
  40. 28

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