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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 940 · 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 86 =
  2. 2.Double 24 =
  3. 3.Double 98 =
  4. 4.Half of 102 =
  5. 5.Double 99 =
  6. 6.Double 18 =
  7. 7.Double 16 =
  8. 8.Double 36 =
  9. 9.Double 41 =
  10. 10.Double 21 =
  11. 11.Half of 196 =
  12. 12.Half of 82 =
  13. 13.Double 97 =
  14. 14.Half of 126 =
  15. 15.Double 29 =
  16. 16.Double 84 =
  17. 17.Double 61 =
  18. 18.Half of 182 =
  19. 19.Double 28 =
  20. 20.Half of 66 =
  21. 21.Half of 180 =
  22. 22.Half of 124 =
  23. 23.Double 96 =
  24. 24.Half of 96 =
  25. 25.Double 42 =
  26. 26.Half of 70 =
  27. 27.Double 34 =
  28. 28.Half of 170 =
  29. 29.Double 63 =
  30. 30.Double 82 =
  31. 31.Double 47 =
  32. 32.Double 88 =
  33. 33.Half of 72 =
  34. 34.Half of 58 =
  35. 35.Half of 48 =
  36. 36.Double 33 =
  37. 37.Double 25 =
  38. 38.Half of 64 =
  39. 39.Double 86 =
  40. 40.Half of 164 =

Answer key

  1. 43
  2. 48
  3. 196
  4. 51
  5. 198
  6. 36
  7. 32
  8. 72
  9. 82
  10. 42
  11. 98
  12. 41
  13. 194
  14. 63
  15. 58
  16. 168
  17. 122
  18. 91
  19. 56
  20. 33
  21. 90
  22. 62
  23. 192
  24. 48
  25. 84
  26. 35
  27. 68
  28. 85
  29. 126
  30. 164
  31. 94
  32. 176
  33. 36
  34. 29
  35. 24
  36. 66
  37. 50
  38. 32
  39. 172
  40. 82

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