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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 775 · 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 54 =
  2. 2.Half of 88 =
  3. 3.Half of 188 =
  4. 4.Double 52 =
  5. 5.Half of 80 =
  6. 6.Half of 148 =
  7. 7.Double 27 =
  8. 8.Double 25 =
  9. 9.Half of 174 =
  10. 10.Half of 182 =
  11. 11.Half of 68 =
  12. 12.Half of 40 =
  13. 13.Double 32 =
  14. 14.Half of 156 =
  15. 15.Double 43 =
  16. 16.Half of 50 =
  17. 17.Double 63 =
  18. 18.Half of 52 =
  19. 19.Double 67 =
  20. 20.Double 91 =
  21. 21.Double 34 =
  22. 22.Half of 32 =
  23. 23.Double 75 =
  24. 24.Double 35 =
  25. 25.Half of 146 =
  26. 26.Double 99 =
  27. 27.Half of 128 =
  28. 28.Half of 94 =
  29. 29.Double 18 =
  30. 30.Half of 48 =
  31. 31.Double 38 =
  32. 32.Half of 150 =
  33. 33.Double 95 =
  34. 34.Double 39 =
  35. 35.Double 46 =
  36. 36.Half of 76 =
  37. 37.Double 28 =
  38. 38.Half of 104 =
  39. 39.Half of 38 =
  40. 40.Half of 26 =

Answer key

  1. 108
  2. 44
  3. 94
  4. 104
  5. 40
  6. 74
  7. 54
  8. 50
  9. 87
  10. 91
  11. 34
  12. 20
  13. 64
  14. 78
  15. 86
  16. 25
  17. 126
  18. 26
  19. 134
  20. 182
  21. 68
  22. 16
  23. 150
  24. 70
  25. 73
  26. 198
  27. 64
  28. 47
  29. 36
  30. 24
  31. 76
  32. 75
  33. 190
  34. 78
  35. 92
  36. 38
  37. 56
  38. 52
  39. 19
  40. 13

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