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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 495 · 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 16 =
  2. 2.Double 44 =
  3. 3.Double 33 =
  4. 4.Double 65 =
  5. 5.Double 78 =
  6. 6.Half of 194 =
  7. 7.Double 46 =
  8. 8.Double 55 =
  9. 9.Half of 106 =
  10. 10.Half of 32 =
  11. 11.Double 85 =
  12. 12.Double 75 =
  13. 13.Double 54 =
  14. 14.Half of 72 =
  15. 15.Double 57 =
  16. 16.Double 45 =
  17. 17.Double 87 =
  18. 18.Half of 108 =
  19. 19.Half of 124 =
  20. 20.Half of 112 =
  21. 21.Half of 76 =
  22. 22.Double 21 =
  23. 23.Half of 70 =
  24. 24.Double 29 =
  25. 25.Double 31 =
  26. 26.Half of 44 =
  27. 27.Double 77 =
  28. 28.Half of 68 =
  29. 29.Double 96 =
  30. 30.Double 34 =
  31. 31.Double 88 =
  32. 32.Double 91 =
  33. 33.Half of 48 =
  34. 34.Half of 78 =
  35. 35.Half of 136 =
  36. 36.Double 98 =
  37. 37.Double 51 =
  38. 38.Double 26 =
  39. 39.Double 22 =
  40. 40.Half of 38 =

Answer key

  1. 32
  2. 88
  3. 66
  4. 130
  5. 156
  6. 97
  7. 92
  8. 110
  9. 53
  10. 16
  11. 170
  12. 150
  13. 108
  14. 36
  15. 114
  16. 90
  17. 174
  18. 54
  19. 62
  20. 56
  21. 38
  22. 42
  23. 35
  24. 58
  25. 62
  26. 22
  27. 154
  28. 34
  29. 192
  30. 68
  31. 176
  32. 182
  33. 24
  34. 39
  35. 68
  36. 196
  37. 102
  38. 52
  39. 44
  40. 19

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