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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 881 · 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 52 =
  2. 2.Double 49 =
  3. 3.Double 79 =
  4. 4.Double 71 =
  5. 5.Half of 34 =
  6. 6.Double 62 =
  7. 7.Half of 190 =
  8. 8.Half of 188 =
  9. 9.Double 41 =
  10. 10.Double 91 =
  11. 11.Half of 72 =
  12. 12.Double 39 =
  13. 13.Double 51 =
  14. 14.Half of 36 =
  15. 15.Double 68 =
  16. 16.Double 35 =
  17. 17.Double 37 =
  18. 18.Half of 38 =
  19. 19.Double 29 =
  20. 20.Double 34 =
  21. 21.Half of 50 =
  22. 22.Half of 48 =
  23. 23.Double 95 =
  24. 24.Double 52 =
  25. 25.Half of 92 =
  26. 26.Double 36 =
  27. 27.Double 48 =
  28. 28.Half of 84 =
  29. 29.Half of 86 =
  30. 30.Half of 100 =
  31. 31.Half of 146 =
  32. 32.Double 33 =
  33. 33.Double 88 =
  34. 34.Double 74 =
  35. 35.Double 76 =
  36. 36.Double 56 =
  37. 37.Double 43 =
  38. 38.Half of 102 =
  39. 39.Double 64 =
  40. 40.Half of 26 =

Answer key

  1. 26
  2. 98
  3. 158
  4. 142
  5. 17
  6. 124
  7. 95
  8. 94
  9. 82
  10. 182
  11. 36
  12. 78
  13. 102
  14. 18
  15. 136
  16. 70
  17. 74
  18. 19
  19. 58
  20. 68
  21. 25
  22. 24
  23. 190
  24. 104
  25. 46
  26. 72
  27. 96
  28. 42
  29. 43
  30. 50
  31. 73
  32. 66
  33. 176
  34. 148
  35. 152
  36. 112
  37. 86
  38. 51
  39. 128
  40. 13

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