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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 655 · 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 28 =
  2. 2.Double 71 =
  3. 3.Half of 62 =
  4. 4.Double 16 =
  5. 5.Half of 66 =
  6. 6.Half of 176 =
  7. 7.Half of 50 =
  8. 8.Double 94 =
  9. 9.Double 59 =
  10. 10.Half of 98 =
  11. 11.Double 96 =
  12. 12.Double 77 =
  13. 13.Double 25 =
  14. 14.Double 53 =
  15. 15.Half of 182 =
  16. 16.Double 44 =
  17. 17.Double 61 =
  18. 18.Double 78 =
  19. 19.Half of 26 =
  20. 20.Double 31 =
  21. 21.Half of 86 =
  22. 22.Half of 100 =
  23. 23.Half of 70 =
  24. 24.Double 99 =
  25. 25.Double 87 =
  26. 26.Double 19 =
  27. 27.Double 81 =
  28. 28.Double 95 =
  29. 29.Half of 40 =
  30. 30.Double 88 =
  31. 31.Half of 162 =
  32. 32.Half of 158 =
  33. 33.Half of 156 =
  34. 34.Double 33 =
  35. 35.Double 68 =
  36. 36.Half of 152 =
  37. 37.Half of 80 =
  38. 38.Double 47 =
  39. 39.Double 34 =
  40. 40.Half of 58 =

Answer key

  1. 14
  2. 142
  3. 31
  4. 32
  5. 33
  6. 88
  7. 25
  8. 188
  9. 118
  10. 49
  11. 192
  12. 154
  13. 50
  14. 106
  15. 91
  16. 88
  17. 122
  18. 156
  19. 13
  20. 62
  21. 43
  22. 50
  23. 35
  24. 198
  25. 174
  26. 38
  27. 162
  28. 190
  29. 20
  30. 176
  31. 81
  32. 79
  33. 78
  34. 66
  35. 136
  36. 76
  37. 40
  38. 94
  39. 68
  40. 29

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