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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 832 · 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 39 =
  2. 2.Double 91 =
  3. 3.Double 43 =
  4. 4.Half of 130 =
  5. 5.Double 77 =
  6. 6.Double 47 =
  7. 7.Half of 106 =
  8. 8.Half of 108 =
  9. 9.Half of 42 =
  10. 10.Double 31 =
  11. 11.Double 34 =
  12. 12.Double 24 =
  13. 13.Half of 136 =
  14. 14.Double 22 =
  15. 15.Half of 26 =
  16. 16.Half of 102 =
  17. 17.Half of 30 =
  18. 18.Half of 178 =
  19. 19.Half of 28 =
  20. 20.Double 21 =
  21. 21.Half of 84 =
  22. 22.Double 19 =
  23. 23.Half of 126 =
  24. 24.Half of 148 =
  25. 25.Double 81 =
  26. 26.Half of 132 =
  27. 27.Double 94 =
  28. 28.Double 16 =
  29. 29.Half of 104 =
  30. 30.Double 32 =
  31. 31.Double 41 =
  32. 32.Half of 48 =
  33. 33.Double 42 =
  34. 34.Double 86 =
  35. 35.Half of 110 =
  36. 36.Double 58 =
  37. 37.Half of 34 =
  38. 38.Half of 90 =
  39. 39.Half of 162 =
  40. 40.Half of 114 =

Answer key

  1. 78
  2. 182
  3. 86
  4. 65
  5. 154
  6. 94
  7. 53
  8. 54
  9. 21
  10. 62
  11. 68
  12. 48
  13. 68
  14. 44
  15. 13
  16. 51
  17. 15
  18. 89
  19. 14
  20. 42
  21. 42
  22. 38
  23. 63
  24. 74
  25. 162
  26. 66
  27. 188
  28. 32
  29. 52
  30. 64
  31. 82
  32. 24
  33. 84
  34. 172
  35. 55
  36. 116
  37. 17
  38. 45
  39. 81
  40. 57

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