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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 109 · 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 128 =
  2. 2.Double 33 =
  3. 3.Double 47 =
  4. 4.Half of 130 =
  5. 5.Double 32 =
  6. 6.Double 61 =
  7. 7.Double 35 =
  8. 8.Half of 162 =
  9. 9.Half of 198 =
  10. 10.Half of 86 =
  11. 11.Double 67 =
  12. 12.Half of 114 =
  13. 13.Double 66 =
  14. 14.Half of 168 =
  15. 15.Half of 88 =
  16. 16.Half of 106 =
  17. 17.Double 31 =
  18. 18.Double 86 =
  19. 19.Half of 142 =
  20. 20.Half of 90 =
  21. 21.Double 75 =
  22. 22.Half of 66 =
  23. 23.Half of 26 =
  24. 24.Half of 104 =
  25. 25.Half of 176 =
  26. 26.Double 79 =
  27. 27.Half of 28 =
  28. 28.Half of 68 =
  29. 29.Double 21 =
  30. 30.Double 16 =
  31. 31.Half of 74 =
  32. 32.Double 23 =
  33. 33.Double 17 =
  34. 34.Double 52 =
  35. 35.Half of 112 =
  36. 36.Double 26 =
  37. 37.Double 19 =
  38. 38.Half of 124 =
  39. 39.Half of 196 =
  40. 40.Double 87 =

Answer key

  1. 64
  2. 66
  3. 94
  4. 65
  5. 64
  6. 122
  7. 70
  8. 81
  9. 99
  10. 43
  11. 134
  12. 57
  13. 132
  14. 84
  15. 44
  16. 53
  17. 62
  18. 172
  19. 71
  20. 45
  21. 150
  22. 33
  23. 13
  24. 52
  25. 88
  26. 158
  27. 14
  28. 34
  29. 42
  30. 32
  31. 37
  32. 46
  33. 34
  34. 104
  35. 56
  36. 52
  37. 38
  38. 62
  39. 98
  40. 174

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