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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 551 · 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 148 =
  2. 2.Half of 162 =
  3. 3.Double 51 =
  4. 4.Half of 42 =
  5. 5.Double 24 =
  6. 6.Double 97 =
  7. 7.Half of 26 =
  8. 8.Half of 128 =
  9. 9.Double 66 =
  10. 10.Half of 28 =
  11. 11.Half of 188 =
  12. 12.Double 67 =
  13. 13.Double 33 =
  14. 14.Double 95 =
  15. 15.Double 59 =
  16. 16.Half of 168 =
  17. 17.Double 34 =
  18. 18.Half of 76 =
  19. 19.Half of 64 =
  20. 20.Double 48 =
  21. 21.Double 22 =
  22. 22.Double 65 =
  23. 23.Double 79 =
  24. 24.Half of 134 =
  25. 25.Double 16 =
  26. 26.Double 92 =
  27. 27.Double 45 =
  28. 28.Double 94 =
  29. 29.Half of 164 =
  30. 30.Double 53 =
  31. 31.Half of 132 =
  32. 32.Half of 84 =
  33. 33.Half of 74 =
  34. 34.Half of 40 =
  35. 35.Double 98 =
  36. 36.Half of 92 =
  37. 37.Half of 50 =
  38. 38.Double 73 =
  39. 39.Half of 186 =
  40. 40.Double 37 =

Answer key

  1. 74
  2. 81
  3. 102
  4. 21
  5. 48
  6. 194
  7. 13
  8. 64
  9. 132
  10. 14
  11. 94
  12. 134
  13. 66
  14. 190
  15. 118
  16. 84
  17. 68
  18. 38
  19. 32
  20. 96
  21. 44
  22. 130
  23. 158
  24. 67
  25. 32
  26. 184
  27. 90
  28. 188
  29. 82
  30. 106
  31. 66
  32. 42
  33. 37
  34. 20
  35. 196
  36. 46
  37. 25
  38. 146
  39. 93
  40. 74

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