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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 756 · 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 134 =
  2. 2.Half of 62 =
  3. 3.Half of 154 =
  4. 4.Double 23 =
  5. 5.Double 24 =
  6. 6.Half of 50 =
  7. 7.Half of 94 =
  8. 8.Double 35 =
  9. 9.Double 56 =
  10. 10.Half of 70 =
  11. 11.Double 89 =
  12. 12.Half of 126 =
  13. 13.Double 59 =
  14. 14.Half of 118 =
  15. 15.Half of 52 =
  16. 16.Half of 108 =
  17. 17.Half of 152 =
  18. 18.Half of 156 =
  19. 19.Double 31 =
  20. 20.Half of 142 =
  21. 21.Half of 120 =
  22. 22.Half of 60 =
  23. 23.Double 92 =
  24. 24.Double 19 =
  25. 25.Half of 196 =
  26. 26.Half of 102 =
  27. 27.Half of 190 =
  28. 28.Half of 112 =
  29. 29.Double 68 =
  30. 30.Half of 68 =
  31. 31.Double 54 =
  32. 32.Half of 166 =
  33. 33.Half of 162 =
  34. 34.Double 28 =
  35. 35.Double 46 =
  36. 36.Double 88 =
  37. 37.Half of 164 =
  38. 38.Double 26 =
  39. 39.Double 16 =
  40. 40.Double 37 =

Answer key

  1. 67
  2. 31
  3. 77
  4. 46
  5. 48
  6. 25
  7. 47
  8. 70
  9. 112
  10. 35
  11. 178
  12. 63
  13. 118
  14. 59
  15. 26
  16. 54
  17. 76
  18. 78
  19. 62
  20. 71
  21. 60
  22. 30
  23. 184
  24. 38
  25. 98
  26. 51
  27. 95
  28. 56
  29. 136
  30. 34
  31. 108
  32. 83
  33. 81
  34. 56
  35. 92
  36. 176
  37. 82
  38. 52
  39. 32
  40. 74

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