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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 447 · 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 69 =
  2. 2.Double 71 =
  3. 3.Half of 168 =
  4. 4.Double 93 =
  5. 5.Double 77 =
  6. 6.Double 64 =
  7. 7.Half of 96 =
  8. 8.Half of 178 =
  9. 9.Half of 32 =
  10. 10.Double 65 =
  11. 11.Half of 26 =
  12. 12.Half of 196 =
  13. 13.Half of 138 =
  14. 14.Half of 126 =
  15. 15.Half of 66 =
  16. 16.Double 52 =
  17. 17.Double 88 =
  18. 18.Half of 118 =
  19. 19.Double 24 =
  20. 20.Double 16 =
  21. 21.Double 73 =
  22. 22.Double 31 =
  23. 23.Double 48 =
  24. 24.Double 82 =
  25. 25.Half of 160 =
  26. 26.Half of 180 =
  27. 27.Double 54 =
  28. 28.Double 86 =
  29. 29.Half of 120 =
  30. 30.Double 94 =
  31. 31.Double 56 =
  32. 32.Double 74 =
  33. 33.Half of 64 =
  34. 34.Double 76 =
  35. 35.Double 23 =
  36. 36.Half of 124 =
  37. 37.Half of 166 =
  38. 38.Double 36 =
  39. 39.Double 45 =
  40. 40.Half of 146 =

Answer key

  1. 138
  2. 142
  3. 84
  4. 186
  5. 154
  6. 128
  7. 48
  8. 89
  9. 16
  10. 130
  11. 13
  12. 98
  13. 69
  14. 63
  15. 33
  16. 104
  17. 176
  18. 59
  19. 48
  20. 32
  21. 146
  22. 62
  23. 96
  24. 164
  25. 80
  26. 90
  27. 108
  28. 172
  29. 60
  30. 188
  31. 112
  32. 148
  33. 32
  34. 152
  35. 46
  36. 62
  37. 83
  38. 72
  39. 90
  40. 73

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