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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 627 · 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 22 =
  2. 2.Half of 48 =
  3. 3.Double 39 =
  4. 4.Half of 34 =
  5. 5.Double 32 =
  6. 6.Half of 82 =
  7. 7.Double 48 =
  8. 8.Double 44 =
  9. 9.Double 91 =
  10. 10.Double 41 =
  11. 11.Double 45 =
  12. 12.Half of 184 =
  13. 13.Half of 122 =
  14. 14.Double 56 =
  15. 15.Double 72 =
  16. 16.Double 47 =
  17. 17.Half of 94 =
  18. 18.Half of 64 =
  19. 19.Double 51 =
  20. 20.Half of 76 =
  21. 21.Half of 96 =
  22. 22.Double 85 =
  23. 23.Half of 26 =
  24. 24.Double 31 =
  25. 25.Double 21 =
  26. 26.Half of 86 =
  27. 27.Double 65 =
  28. 28.Half of 152 =
  29. 29.Half of 102 =
  30. 30.Half of 110 =
  31. 31.Half of 98 =
  32. 32.Double 49 =
  33. 33.Double 92 =
  34. 34.Double 71 =
  35. 35.Double 88 =
  36. 36.Half of 56 =
  37. 37.Half of 174 =
  38. 38.Double 37 =
  39. 39.Half of 180 =
  40. 40.Half of 148 =

Answer key

  1. 44
  2. 24
  3. 78
  4. 17
  5. 64
  6. 41
  7. 96
  8. 88
  9. 182
  10. 82
  11. 90
  12. 92
  13. 61
  14. 112
  15. 144
  16. 94
  17. 47
  18. 32
  19. 102
  20. 38
  21. 48
  22. 170
  23. 13
  24. 62
  25. 42
  26. 43
  27. 130
  28. 76
  29. 51
  30. 55
  31. 49
  32. 98
  33. 184
  34. 142
  35. 176
  36. 28
  37. 87
  38. 74
  39. 90
  40. 74

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