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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 651 · 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 76 =
  2. 2.Half of 28 =
  3. 3.Half of 58 =
  4. 4.Double 36 =
  5. 5.Double 66 =
  6. 6.Half of 184 =
  7. 7.Double 21 =
  8. 8.Double 96 =
  9. 9.Half of 62 =
  10. 10.Double 92 =
  11. 11.Double 23 =
  12. 12.Half of 112 =
  13. 13.Double 34 =
  14. 14.Double 91 =
  15. 15.Double 52 =
  16. 16.Half of 52 =
  17. 17.Half of 190 =
  18. 18.Half of 54 =
  19. 19.Double 64 =
  20. 20.Half of 152 =
  21. 21.Half of 50 =
  22. 22.Half of 108 =
  23. 23.Half of 160 =
  24. 24.Half of 142 =
  25. 25.Double 24 =
  26. 26.Half of 128 =
  27. 27.Half of 30 =
  28. 28.Double 18 =
  29. 29.Half of 154 =
  30. 30.Half of 34 =
  31. 31.Double 47 =
  32. 32.Double 65 =
  33. 33.Double 49 =
  34. 34.Half of 178 =
  35. 35.Half of 44 =
  36. 36.Half of 46 =
  37. 37.Half of 132 =
  38. 38.Double 71 =
  39. 39.Double 83 =
  40. 40.Double 81 =

Answer key

  1. 152
  2. 14
  3. 29
  4. 72
  5. 132
  6. 92
  7. 42
  8. 192
  9. 31
  10. 184
  11. 46
  12. 56
  13. 68
  14. 182
  15. 104
  16. 26
  17. 95
  18. 27
  19. 128
  20. 76
  21. 25
  22. 54
  23. 80
  24. 71
  25. 48
  26. 64
  27. 15
  28. 36
  29. 77
  30. 17
  31. 94
  32. 130
  33. 98
  34. 89
  35. 22
  36. 23
  37. 66
  38. 142
  39. 166
  40. 162

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