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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 419 · 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 116 =
  2. 2.Double 64 =
  3. 3.Double 21 =
  4. 4.Half of 168 =
  5. 5.Double 44 =
  6. 6.Half of 40 =
  7. 7.Double 94 =
  8. 8.Half of 68 =
  9. 9.Half of 104 =
  10. 10.Double 96 =
  11. 11.Double 45 =
  12. 12.Double 41 =
  13. 13.Double 69 =
  14. 14.Double 65 =
  15. 15.Half of 94 =
  16. 16.Double 63 =
  17. 17.Half of 42 =
  18. 18.Double 59 =
  19. 19.Double 28 =
  20. 20.Double 98 =
  21. 21.Double 71 =
  22. 22.Half of 192 =
  23. 23.Double 52 =
  24. 24.Half of 70 =
  25. 25.Double 84 =
  26. 26.Double 32 =
  27. 27.Double 51 =
  28. 28.Half of 174 =
  29. 29.Double 91 =
  30. 30.Half of 72 =
  31. 31.Double 16 =
  32. 32.Double 66 =
  33. 33.Double 93 =
  34. 34.Half of 170 =
  35. 35.Double 55 =
  36. 36.Half of 66 =
  37. 37.Double 36 =
  38. 38.Half of 180 =
  39. 39.Half of 162 =
  40. 40.Double 38 =

Answer key

  1. 58
  2. 128
  3. 42
  4. 84
  5. 88
  6. 20
  7. 188
  8. 34
  9. 52
  10. 192
  11. 90
  12. 82
  13. 138
  14. 130
  15. 47
  16. 126
  17. 21
  18. 118
  19. 56
  20. 196
  21. 142
  22. 96
  23. 104
  24. 35
  25. 168
  26. 64
  27. 102
  28. 87
  29. 182
  30. 36
  31. 32
  32. 132
  33. 186
  34. 85
  35. 110
  36. 33
  37. 72
  38. 90
  39. 81
  40. 76

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