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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 22 · 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 88 =
  2. 2.Double 71 =
  3. 3.Double 43 =
  4. 4.Double 96 =
  5. 5.Half of 148 =
  6. 6.Double 58 =
  7. 7.Half of 76 =
  8. 8.Double 75 =
  9. 9.Half of 92 =
  10. 10.Double 84 =
  11. 11.Double 72 =
  12. 12.Half of 162 =
  13. 13.Double 41 =
  14. 14.Double 68 =
  15. 15.Double 97 =
  16. 16.Half of 146 =
  17. 17.Half of 74 =
  18. 18.Double 85 =
  19. 19.Half of 68 =
  20. 20.Double 48 =
  21. 21.Half of 196 =
  22. 22.Double 37 =
  23. 23.Double 38 =
  24. 24.Half of 48 =
  25. 25.Half of 180 =
  26. 26.Half of 32 =
  27. 27.Half of 50 =
  28. 28.Double 52 =
  29. 29.Half of 140 =
  30. 30.Half of 178 =
  31. 31.Double 66 =
  32. 32.Double 54 =
  33. 33.Half of 144 =
  34. 34.Half of 84 =
  35. 35.Double 28 =
  36. 36.Double 39 =
  37. 37.Double 32 =
  38. 38.Double 91 =
  39. 39.Half of 36 =
  40. 40.Double 27 =

Answer key

  1. 176
  2. 142
  3. 86
  4. 192
  5. 74
  6. 116
  7. 38
  8. 150
  9. 46
  10. 168
  11. 144
  12. 81
  13. 82
  14. 136
  15. 194
  16. 73
  17. 37
  18. 170
  19. 34
  20. 96
  21. 98
  22. 74
  23. 76
  24. 24
  25. 90
  26. 16
  27. 25
  28. 104
  29. 70
  30. 89
  31. 132
  32. 108
  33. 72
  34. 42
  35. 56
  36. 78
  37. 64
  38. 182
  39. 18
  40. 54

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