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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 206 · 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 62 =
  2. 2.Half of 58 =
  3. 3.Double 75 =
  4. 4.Half of 164 =
  5. 5.Double 44 =
  6. 6.Half of 154 =
  7. 7.Double 58 =
  8. 8.Half of 128 =
  9. 9.Half of 90 =
  10. 10.Half of 170 =
  11. 11.Half of 44 =
  12. 12.Double 23 =
  13. 13.Double 91 =
  14. 14.Double 34 =
  15. 15.Half of 192 =
  16. 16.Half of 138 =
  17. 17.Double 66 =
  18. 18.Double 18 =
  19. 19.Double 52 =
  20. 20.Double 89 =
  21. 21.Double 24 =
  22. 22.Double 35 =
  23. 23.Half of 158 =
  24. 24.Double 99 =
  25. 25.Half of 190 =
  26. 26.Double 21 =
  27. 27.Half of 76 =
  28. 28.Double 56 =
  29. 29.Double 59 =
  30. 30.Double 65 =
  31. 31.Double 27 =
  32. 32.Double 61 =
  33. 33.Double 41 =
  34. 34.Half of 198 =
  35. 35.Double 36 =
  36. 36.Double 98 =
  37. 37.Half of 40 =
  38. 38.Double 81 =
  39. 39.Half of 38 =
  40. 40.Double 63 =

Answer key

  1. 31
  2. 29
  3. 150
  4. 82
  5. 88
  6. 77
  7. 116
  8. 64
  9. 45
  10. 85
  11. 22
  12. 46
  13. 182
  14. 68
  15. 96
  16. 69
  17. 132
  18. 36
  19. 104
  20. 178
  21. 48
  22. 70
  23. 79
  24. 198
  25. 95
  26. 42
  27. 38
  28. 112
  29. 118
  30. 130
  31. 54
  32. 122
  33. 82
  34. 99
  35. 72
  36. 196
  37. 20
  38. 162
  39. 19
  40. 126

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