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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 922 · 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 98 =
  2. 2.Double 78 =
  3. 3.Double 91 =
  4. 4.Double 31 =
  5. 5.Half of 190 =
  6. 6.Double 32 =
  7. 7.Half of 156 =
  8. 8.Double 24 =
  9. 9.Double 94 =
  10. 10.Double 97 =
  11. 11.Double 73 =
  12. 12.Half of 118 =
  13. 13.Double 54 =
  14. 14.Double 98 =
  15. 15.Double 22 =
  16. 16.Double 44 =
  17. 17.Half of 196 =
  18. 18.Half of 90 =
  19. 19.Double 71 =
  20. 20.Half of 54 =
  21. 21.Double 16 =
  22. 22.Double 57 =
  23. 23.Half of 116 =
  24. 24.Double 66 =
  25. 25.Double 84 =
  26. 26.Double 75 =
  27. 27.Double 81 =
  28. 28.Double 65 =
  29. 29.Half of 136 =
  30. 30.Half of 138 =
  31. 31.Half of 56 =
  32. 32.Half of 178 =
  33. 33.Half of 76 =
  34. 34.Half of 74 =
  35. 35.Half of 58 =
  36. 36.Half of 152 =
  37. 37.Double 45 =
  38. 38.Double 74 =
  39. 39.Double 62 =
  40. 40.Half of 102 =

Answer key

  1. 49
  2. 156
  3. 182
  4. 62
  5. 95
  6. 64
  7. 78
  8. 48
  9. 188
  10. 194
  11. 146
  12. 59
  13. 108
  14. 196
  15. 44
  16. 88
  17. 98
  18. 45
  19. 142
  20. 27
  21. 32
  22. 114
  23. 58
  24. 132
  25. 168
  26. 150
  27. 162
  28. 130
  29. 68
  30. 69
  31. 28
  32. 89
  33. 38
  34. 37
  35. 29
  36. 76
  37. 90
  38. 148
  39. 124
  40. 51

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