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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 513 · 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 37 =
  2. 2.Half of 192 =
  3. 3.Double 29 =
  4. 4.Half of 156 =
  5. 5.Half of 136 =
  6. 6.Double 26 =
  7. 7.Half of 180 =
  8. 8.Double 73 =
  9. 9.Double 57 =
  10. 10.Half of 34 =
  11. 11.Double 81 =
  12. 12.Half of 60 =
  13. 13.Double 35 =
  14. 14.Double 87 =
  15. 15.Double 63 =
  16. 16.Double 39 =
  17. 17.Half of 74 =
  18. 18.Double 91 =
  19. 19.Double 41 =
  20. 20.Double 74 =
  21. 21.Double 27 =
  22. 22.Double 25 =
  23. 23.Double 38 =
  24. 24.Half of 72 =
  25. 25.Half of 178 =
  26. 26.Double 77 =
  27. 27.Double 16 =
  28. 28.Double 96 =
  29. 29.Double 98 =
  30. 30.Double 51 =
  31. 31.Half of 128 =
  32. 32.Double 34 =
  33. 33.Double 21 =
  34. 34.Half of 68 =
  35. 35.Half of 108 =
  36. 36.Half of 148 =
  37. 37.Half of 70 =
  38. 38.Half of 110 =
  39. 39.Half of 176 =
  40. 40.Double 62 =

Answer key

  1. 74
  2. 96
  3. 58
  4. 78
  5. 68
  6. 52
  7. 90
  8. 146
  9. 114
  10. 17
  11. 162
  12. 30
  13. 70
  14. 174
  15. 126
  16. 78
  17. 37
  18. 182
  19. 82
  20. 148
  21. 54
  22. 50
  23. 76
  24. 36
  25. 89
  26. 154
  27. 32
  28. 192
  29. 196
  30. 102
  31. 64
  32. 68
  33. 42
  34. 34
  35. 54
  36. 74
  37. 35
  38. 55
  39. 88
  40. 124

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