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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 947 · 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 118 =
  2. 2.Double 89 =
  3. 3.Double 21 =
  4. 4.Half of 76 =
  5. 5.Double 76 =
  6. 6.Double 53 =
  7. 7.Half of 102 =
  8. 8.Double 24 =
  9. 9.Double 66 =
  10. 10.Half of 154 =
  11. 11.Half of 140 =
  12. 12.Half of 192 =
  13. 13.Half of 174 =
  14. 14.Half of 80 =
  15. 15.Half of 62 =
  16. 16.Double 85 =
  17. 17.Double 96 =
  18. 18.Half of 176 =
  19. 19.Double 86 =
  20. 20.Double 81 =
  21. 21.Half of 58 =
  22. 22.Double 94 =
  23. 23.Double 26 =
  24. 24.Half of 70 =
  25. 25.Double 51 =
  26. 26.Double 91 =
  27. 27.Double 64 =
  28. 28.Half of 126 =
  29. 29.Double 48 =
  30. 30.Half of 184 =
  31. 31.Half of 144 =
  32. 32.Double 41 =
  33. 33.Double 78 =
  34. 34.Half of 26 =
  35. 35.Double 18 =
  36. 36.Half of 68 =
  37. 37.Half of 142 =
  38. 38.Half of 152 =
  39. 39.Half of 52 =
  40. 40.Double 97 =

Answer key

  1. 59
  2. 178
  3. 42
  4. 38
  5. 152
  6. 106
  7. 51
  8. 48
  9. 132
  10. 77
  11. 70
  12. 96
  13. 87
  14. 40
  15. 31
  16. 170
  17. 192
  18. 88
  19. 172
  20. 162
  21. 29
  22. 188
  23. 52
  24. 35
  25. 102
  26. 182
  27. 128
  28. 63
  29. 96
  30. 92
  31. 72
  32. 82
  33. 156
  34. 13
  35. 36
  36. 34
  37. 71
  38. 76
  39. 26
  40. 194

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