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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 658 · 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 21 =
  2. 2.Double 48 =
  3. 3.Double 42 =
  4. 4.Half of 120 =
  5. 5.Double 54 =
  6. 6.Double 47 =
  7. 7.Double 94 =
  8. 8.Half of 178 =
  9. 9.Double 51 =
  10. 10.Half of 50 =
  11. 11.Half of 194 =
  12. 12.Half of 52 =
  13. 13.Half of 136 =
  14. 14.Half of 48 =
  15. 15.Half of 144 =
  16. 16.Half of 64 =
  17. 17.Double 28 =
  18. 18.Double 74 =
  19. 19.Double 58 =
  20. 20.Double 71 =
  21. 21.Double 64 =
  22. 22.Half of 34 =
  23. 23.Half of 90 =
  24. 24.Double 52 =
  25. 25.Half of 156 =
  26. 26.Half of 68 =
  27. 27.Half of 40 =
  28. 28.Double 91 =
  29. 29.Half of 32 =
  30. 30.Half of 38 =
  31. 31.Half of 58 =
  32. 32.Double 65 =
  33. 33.Double 69 =
  34. 34.Half of 72 =
  35. 35.Half of 82 =
  36. 36.Double 17 =
  37. 37.Double 18 =
  38. 38.Double 73 =
  39. 39.Half of 86 =
  40. 40.Double 27 =

Answer key

  1. 42
  2. 96
  3. 84
  4. 60
  5. 108
  6. 94
  7. 188
  8. 89
  9. 102
  10. 25
  11. 97
  12. 26
  13. 68
  14. 24
  15. 72
  16. 32
  17. 56
  18. 148
  19. 116
  20. 142
  21. 128
  22. 17
  23. 45
  24. 104
  25. 78
  26. 34
  27. 20
  28. 182
  29. 16
  30. 19
  31. 29
  32. 130
  33. 138
  34. 36
  35. 41
  36. 34
  37. 36
  38. 146
  39. 43
  40. 54

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