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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 956 · 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 67 =
  2. 2.Half of 70 =
  3. 3.Double 23 =
  4. 4.Double 73 =
  5. 5.Half of 56 =
  6. 6.Double 82 =
  7. 7.Double 89 =
  8. 8.Half of 110 =
  9. 9.Double 32 =
  10. 10.Half of 172 =
  11. 11.Double 34 =
  12. 12.Double 46 =
  13. 13.Double 55 =
  14. 14.Half of 196 =
  15. 15.Half of 46 =
  16. 16.Double 39 =
  17. 17.Half of 62 =
  18. 18.Half of 54 =
  19. 19.Double 36 =
  20. 20.Double 43 =
  21. 21.Double 79 =
  22. 22.Half of 36 =
  23. 23.Half of 90 =
  24. 24.Double 52 =
  25. 25.Double 87 =
  26. 26.Double 31 =
  27. 27.Double 16 =
  28. 28.Half of 158 =
  29. 29.Double 69 =
  30. 30.Double 27 =
  31. 31.Double 33 =
  32. 32.Half of 26 =
  33. 33.Half of 86 =
  34. 34.Double 91 =
  35. 35.Double 86 =
  36. 36.Half of 96 =
  37. 37.Double 88 =
  38. 38.Double 53 =
  39. 39.Double 19 =
  40. 40.Half of 168 =

Answer key

  1. 134
  2. 35
  3. 46
  4. 146
  5. 28
  6. 164
  7. 178
  8. 55
  9. 64
  10. 86
  11. 68
  12. 92
  13. 110
  14. 98
  15. 23
  16. 78
  17. 31
  18. 27
  19. 72
  20. 86
  21. 158
  22. 18
  23. 45
  24. 104
  25. 174
  26. 62
  27. 32
  28. 79
  29. 138
  30. 54
  31. 66
  32. 13
  33. 43
  34. 182
  35. 172
  36. 48
  37. 176
  38. 106
  39. 38
  40. 84

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