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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 489 · 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 72 =
  2. 2.Double 88 =
  3. 3.Double 48 =
  4. 4.Double 86 =
  5. 5.Half of 180 =
  6. 6.Double 71 =
  7. 7.Double 74 =
  8. 8.Double 24 =
  9. 9.Double 43 =
  10. 10.Double 57 =
  11. 11.Double 52 =
  12. 12.Double 44 =
  13. 13.Half of 30 =
  14. 14.Double 28 =
  15. 15.Double 76 =
  16. 16.Half of 42 =
  17. 17.Half of 142 =
  18. 18.Half of 148 =
  19. 19.Half of 150 =
  20. 20.Double 34 =
  21. 21.Double 91 =
  22. 22.Half of 34 =
  23. 23.Double 99 =
  24. 24.Double 64 =
  25. 25.Half of 104 =
  26. 26.Half of 40 =
  27. 27.Half of 126 =
  28. 28.Half of 158 =
  29. 29.Half of 60 =
  30. 30.Double 19 =
  31. 31.Double 17 =
  32. 32.Half of 102 =
  33. 33.Half of 172 =
  34. 34.Half of 80 =
  35. 35.Double 92 =
  36. 36.Half of 84 =
  37. 37.Double 81 =
  38. 38.Double 72 =
  39. 39.Half of 32 =
  40. 40.Half of 132 =

Answer key

  1. 36
  2. 176
  3. 96
  4. 172
  5. 90
  6. 142
  7. 148
  8. 48
  9. 86
  10. 114
  11. 104
  12. 88
  13. 15
  14. 56
  15. 152
  16. 21
  17. 71
  18. 74
  19. 75
  20. 68
  21. 182
  22. 17
  23. 198
  24. 128
  25. 52
  26. 20
  27. 63
  28. 79
  29. 30
  30. 38
  31. 34
  32. 51
  33. 86
  34. 40
  35. 184
  36. 42
  37. 162
  38. 144
  39. 16
  40. 66

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