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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 859 · 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 176 =
  2. 2.Half of 168 =
  3. 3.Half of 112 =
  4. 4.Half of 164 =
  5. 5.Double 51 =
  6. 6.Half of 98 =
  7. 7.Double 64 =
  8. 8.Double 69 =
  9. 9.Half of 46 =
  10. 10.Double 82 =
  11. 11.Double 42 =
  12. 12.Double 86 =
  13. 13.Double 16 =
  14. 14.Half of 142 =
  15. 15.Double 36 =
  16. 16.Double 21 =
  17. 17.Double 81 =
  18. 18.Double 91 =
  19. 19.Half of 26 =
  20. 20.Half of 132 =
  21. 21.Double 28 =
  22. 22.Half of 116 =
  23. 23.Half of 56 =
  24. 24.Half of 36 =
  25. 25.Half of 182 =
  26. 26.Half of 172 =
  27. 27.Double 97 =
  28. 28.Half of 190 =
  29. 29.Half of 88 =
  30. 30.Double 59 =
  31. 31.Half of 54 =
  32. 32.Half of 62 =
  33. 33.Double 27 =
  34. 34.Double 41 =
  35. 35.Half of 102 =
  36. 36.Double 98 =
  37. 37.Half of 154 =
  38. 38.Half of 70 =
  39. 39.Double 92 =
  40. 40.Half of 52 =

Answer key

  1. 88
  2. 84
  3. 56
  4. 82
  5. 102
  6. 49
  7. 128
  8. 138
  9. 23
  10. 164
  11. 84
  12. 172
  13. 32
  14. 71
  15. 72
  16. 42
  17. 162
  18. 182
  19. 13
  20. 66
  21. 56
  22. 58
  23. 28
  24. 18
  25. 91
  26. 86
  27. 194
  28. 95
  29. 44
  30. 118
  31. 27
  32. 31
  33. 54
  34. 82
  35. 51
  36. 196
  37. 77
  38. 35
  39. 184
  40. 26

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