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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 910 · 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 32 =
  2. 2.Half of 110 =
  3. 3.Double 91 =
  4. 4.Double 18 =
  5. 5.Half of 28 =
  6. 6.Double 24 =
  7. 7.Half of 148 =
  8. 8.Double 99 =
  9. 9.Double 21 =
  10. 10.Double 17 =
  11. 11.Double 98 =
  12. 12.Double 54 =
  13. 13.Half of 104 =
  14. 14.Double 96 =
  15. 15.Double 25 =
  16. 16.Double 27 =
  17. 17.Half of 194 =
  18. 18.Half of 98 =
  19. 19.Double 69 =
  20. 20.Double 47 =
  21. 21.Half of 168 =
  22. 22.Double 85 =
  23. 23.Double 93 =
  24. 24.Half of 72 =
  25. 25.Double 72 =
  26. 26.Half of 138 =
  27. 27.Double 57 =
  28. 28.Half of 122 =
  29. 29.Half of 90 =
  30. 30.Double 81 =
  31. 31.Double 61 =
  32. 32.Double 92 =
  33. 33.Half of 36 =
  34. 34.Half of 166 =
  35. 35.Half of 124 =
  36. 36.Half of 180 =
  37. 37.Double 77 =
  38. 38.Double 66 =
  39. 39.Double 89 =
  40. 40.Half of 32 =

Answer key

  1. 64
  2. 55
  3. 182
  4. 36
  5. 14
  6. 48
  7. 74
  8. 198
  9. 42
  10. 34
  11. 196
  12. 108
  13. 52
  14. 192
  15. 50
  16. 54
  17. 97
  18. 49
  19. 138
  20. 94
  21. 84
  22. 170
  23. 186
  24. 36
  25. 144
  26. 69
  27. 114
  28. 61
  29. 45
  30. 162
  31. 122
  32. 184
  33. 18
  34. 83
  35. 62
  36. 90
  37. 154
  38. 132
  39. 178
  40. 16

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