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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 507 · 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 37 =
  2. 2.Double 53 =
  3. 3.Double 89 =
  4. 4.Double 81 =
  5. 5.Half of 108 =
  6. 6.Half of 120 =
  7. 7.Double 16 =
  8. 8.Half of 58 =
  9. 9.Double 31 =
  10. 10.Half of 198 =
  11. 11.Half of 184 =
  12. 12.Half of 160 =
  13. 13.Double 34 =
  14. 14.Half of 148 =
  15. 15.Half of 72 =
  16. 16.Double 86 =
  17. 17.Double 45 =
  18. 18.Half of 78 =
  19. 19.Half of 42 =
  20. 20.Half of 32 =
  21. 21.Half of 156 =
  22. 22.Double 61 =
  23. 23.Double 24 =
  24. 24.Double 32 =
  25. 25.Double 94 =
  26. 26.Half of 128 =
  27. 27.Half of 136 =
  28. 28.Double 17 =
  29. 29.Half of 102 =
  30. 30.Half of 98 =
  31. 31.Half of 38 =
  32. 32.Half of 138 =
  33. 33.Double 99 =
  34. 34.Double 39 =
  35. 35.Half of 104 =
  36. 36.Double 51 =
  37. 37.Half of 90 =
  38. 38.Double 95 =
  39. 39.Half of 34 =
  40. 40.Half of 86 =

Answer key

  1. 74
  2. 106
  3. 178
  4. 162
  5. 54
  6. 60
  7. 32
  8. 29
  9. 62
  10. 99
  11. 92
  12. 80
  13. 68
  14. 74
  15. 36
  16. 172
  17. 90
  18. 39
  19. 21
  20. 16
  21. 78
  22. 122
  23. 48
  24. 64
  25. 188
  26. 64
  27. 68
  28. 34
  29. 51
  30. 49
  31. 19
  32. 69
  33. 198
  34. 78
  35. 52
  36. 102
  37. 45
  38. 190
  39. 17
  40. 43

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