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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 883 · 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 92 =
  2. 2.Half of 132 =
  3. 3.Half of 182 =
  4. 4.Half of 188 =
  5. 5.Half of 82 =
  6. 6.Double 26 =
  7. 7.Double 87 =
  8. 8.Double 27 =
  9. 9.Half of 56 =
  10. 10.Double 93 =
  11. 11.Half of 150 =
  12. 12.Double 37 =
  13. 13.Double 81 =
  14. 14.Half of 152 =
  15. 15.Half of 116 =
  16. 16.Half of 170 =
  17. 17.Double 32 =
  18. 18.Half of 120 =
  19. 19.Double 43 =
  20. 20.Half of 42 =
  21. 21.Half of 178 =
  22. 22.Double 39 =
  23. 23.Double 18 =
  24. 24.Half of 76 =
  25. 25.Half of 34 =
  26. 26.Half of 98 =
  27. 27.Double 97 =
  28. 28.Half of 158 =
  29. 29.Double 94 =
  30. 30.Double 23 =
  31. 31.Half of 128 =
  32. 32.Half of 142 =
  33. 33.Half of 148 =
  34. 34.Half of 138 =
  35. 35.Half of 80 =
  36. 36.Double 33 =
  37. 37.Half of 122 =
  38. 38.Half of 38 =
  39. 39.Half of 68 =
  40. 40.Double 21 =

Answer key

  1. 46
  2. 66
  3. 91
  4. 94
  5. 41
  6. 52
  7. 174
  8. 54
  9. 28
  10. 186
  11. 75
  12. 74
  13. 162
  14. 76
  15. 58
  16. 85
  17. 64
  18. 60
  19. 86
  20. 21
  21. 89
  22. 78
  23. 36
  24. 38
  25. 17
  26. 49
  27. 194
  28. 79
  29. 188
  30. 46
  31. 64
  32. 71
  33. 74
  34. 69
  35. 40
  36. 66
  37. 61
  38. 19
  39. 34
  40. 42

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