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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 862 · 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 94 =
  2. 2.Double 73 =
  3. 3.Double 59 =
  4. 4.Double 72 =
  5. 5.Double 68 =
  6. 6.Double 17 =
  7. 7.Double 58 =
  8. 8.Double 41 =
  9. 9.Double 86 =
  10. 10.Double 77 =
  11. 11.Double 42 =
  12. 12.Double 27 =
  13. 13.Half of 114 =
  14. 14.Double 91 =
  15. 15.Double 64 =
  16. 16.Half of 160 =
  17. 17.Double 66 =
  18. 18.Half of 106 =
  19. 19.Double 65 =
  20. 20.Double 21 =
  21. 21.Double 82 =
  22. 22.Half of 48 =
  23. 23.Half of 136 =
  24. 24.Double 76 =
  25. 25.Half of 168 =
  26. 26.Double 62 =
  27. 27.Half of 66 =
  28. 28.Double 83 =
  29. 29.Double 47 =
  30. 30.Double 78 =
  31. 31.Double 36 =
  32. 32.Double 87 =
  33. 33.Half of 194 =
  34. 34.Double 79 =
  35. 35.Half of 198 =
  36. 36.Half of 140 =
  37. 37.Half of 52 =
  38. 38.Double 24 =
  39. 39.Double 67 =
  40. 40.Half of 196 =

Answer key

  1. 188
  2. 146
  3. 118
  4. 144
  5. 136
  6. 34
  7. 116
  8. 82
  9. 172
  10. 154
  11. 84
  12. 54
  13. 57
  14. 182
  15. 128
  16. 80
  17. 132
  18. 53
  19. 130
  20. 42
  21. 164
  22. 24
  23. 68
  24. 152
  25. 84
  26. 124
  27. 33
  28. 166
  29. 94
  30. 156
  31. 72
  32. 174
  33. 97
  34. 158
  35. 99
  36. 70
  37. 26
  38. 48
  39. 134
  40. 98

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