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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 287 · 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 52 =
  2. 2.Double 36 =
  3. 3.Double 35 =
  4. 4.Double 42 =
  5. 5.Double 21 =
  6. 6.Half of 160 =
  7. 7.Half of 60 =
  8. 8.Half of 192 =
  9. 9.Half of 190 =
  10. 10.Half of 26 =
  11. 11.Double 44 =
  12. 12.Double 17 =
  13. 13.Double 69 =
  14. 14.Double 99 =
  15. 15.Half of 78 =
  16. 16.Half of 58 =
  17. 17.Half of 120 =
  18. 18.Double 33 =
  19. 19.Half of 112 =
  20. 20.Double 88 =
  21. 21.Half of 174 =
  22. 22.Double 66 =
  23. 23.Double 28 =
  24. 24.Half of 138 =
  25. 25.Double 18 =
  26. 26.Half of 68 =
  27. 27.Double 98 =
  28. 28.Half of 36 =
  29. 29.Double 91 =
  30. 30.Half of 148 =
  31. 31.Double 43 =
  32. 32.Double 49 =
  33. 33.Half of 184 =
  34. 34.Half of 180 =
  35. 35.Half of 104 =
  36. 36.Half of 54 =
  37. 37.Half of 110 =
  38. 38.Half of 102 =
  39. 39.Double 71 =
  40. 40.Double 58 =

Answer key

  1. 104
  2. 72
  3. 70
  4. 84
  5. 42
  6. 80
  7. 30
  8. 96
  9. 95
  10. 13
  11. 88
  12. 34
  13. 138
  14. 198
  15. 39
  16. 29
  17. 60
  18. 66
  19. 56
  20. 176
  21. 87
  22. 132
  23. 56
  24. 69
  25. 36
  26. 34
  27. 196
  28. 18
  29. 182
  30. 74
  31. 86
  32. 98
  33. 92
  34. 90
  35. 52
  36. 27
  37. 55
  38. 51
  39. 142
  40. 116

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