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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 874 · 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 96 =
  3. 3.Double 99 =
  4. 4.Double 72 =
  5. 5.Double 56 =
  6. 6.Half of 162 =
  7. 7.Half of 64 =
  8. 8.Double 61 =
  9. 9.Half of 146 =
  10. 10.Double 71 =
  11. 11.Half of 174 =
  12. 12.Half of 158 =
  13. 13.Double 51 =
  14. 14.Half of 110 =
  15. 15.Half of 114 =
  16. 16.Half of 122 =
  17. 17.Half of 130 =
  18. 18.Double 31 =
  19. 19.Double 84 =
  20. 20.Double 24 =
  21. 21.Double 87 =
  22. 22.Double 36 =
  23. 23.Double 57 =
  24. 24.Half of 178 =
  25. 25.Double 38 =
  26. 26.Half of 192 =
  27. 27.Half of 156 =
  28. 28.Half of 90 =
  29. 29.Double 62 =
  30. 30.Double 98 =
  31. 31.Double 91 =
  32. 32.Double 44 =
  33. 33.Double 86 =
  34. 34.Half of 194 =
  35. 35.Double 89 =
  36. 36.Half of 108 =
  37. 37.Half of 44 =
  38. 38.Half of 40 =
  39. 39.Double 58 =
  40. 40.Double 67 =

Answer key

  1. 88
  2. 48
  3. 198
  4. 144
  5. 112
  6. 81
  7. 32
  8. 122
  9. 73
  10. 142
  11. 87
  12. 79
  13. 102
  14. 55
  15. 57
  16. 61
  17. 65
  18. 62
  19. 168
  20. 48
  21. 174
  22. 72
  23. 114
  24. 89
  25. 76
  26. 96
  27. 78
  28. 45
  29. 124
  30. 196
  31. 182
  32. 88
  33. 172
  34. 97
  35. 178
  36. 54
  37. 22
  38. 20
  39. 116
  40. 134

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