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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 964 · 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 42 =
  2. 2.Double 27 =
  3. 3.Half of 152 =
  4. 4.Half of 104 =
  5. 5.Double 82 =
  6. 6.Double 79 =
  7. 7.Half of 166 =
  8. 8.Half of 38 =
  9. 9.Half of 196 =
  10. 10.Double 36 =
  11. 11.Half of 34 =
  12. 12.Double 88 =
  13. 13.Double 75 =
  14. 14.Half of 136 =
  15. 15.Double 58 =
  16. 16.Double 47 =
  17. 17.Double 91 =
  18. 18.Half of 118 =
  19. 19.Half of 114 =
  20. 20.Double 95 =
  21. 21.Double 61 =
  22. 22.Half of 42 =
  23. 23.Double 64 =
  24. 24.Double 17 =
  25. 25.Double 71 =
  26. 26.Double 34 =
  27. 27.Double 86 =
  28. 28.Double 59 =
  29. 29.Half of 160 =
  30. 30.Double 63 =
  31. 31.Half of 158 =
  32. 32.Half of 190 =
  33. 33.Half of 80 =
  34. 34.Double 74 =
  35. 35.Double 98 =
  36. 36.Half of 148 =
  37. 37.Half of 50 =
  38. 38.Double 41 =
  39. 39.Half of 78 =
  40. 40.Half of 56 =

Answer key

  1. 84
  2. 54
  3. 76
  4. 52
  5. 164
  6. 158
  7. 83
  8. 19
  9. 98
  10. 72
  11. 17
  12. 176
  13. 150
  14. 68
  15. 116
  16. 94
  17. 182
  18. 59
  19. 57
  20. 190
  21. 122
  22. 21
  23. 128
  24. 34
  25. 142
  26. 68
  27. 172
  28. 118
  29. 80
  30. 126
  31. 79
  32. 95
  33. 40
  34. 148
  35. 196
  36. 74
  37. 25
  38. 82
  39. 39
  40. 28

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