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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 902 · 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 53 =
  2. 2.Double 47 =
  3. 3.Double 33 =
  4. 4.Double 34 =
  5. 5.Half of 180 =
  6. 6.Double 72 =
  7. 7.Double 48 =
  8. 8.Half of 40 =
  9. 9.Half of 172 =
  10. 10.Half of 158 =
  11. 11.Half of 132 =
  12. 12.Double 85 =
  13. 13.Half of 170 =
  14. 14.Double 69 =
  15. 15.Half of 192 =
  16. 16.Double 16 =
  17. 17.Double 99 =
  18. 18.Half of 68 =
  19. 19.Half of 88 =
  20. 20.Half of 116 =
  21. 21.Double 76 =
  22. 22.Double 18 =
  23. 23.Double 59 =
  24. 24.Half of 92 =
  25. 25.Double 27 =
  26. 26.Double 91 =
  27. 27.Double 38 =
  28. 28.Half of 70 =
  29. 29.Double 43 =
  30. 30.Double 21 =
  31. 31.Half of 86 =
  32. 32.Double 65 =
  33. 33.Double 54 =
  34. 34.Double 61 =
  35. 35.Double 41 =
  36. 36.Double 58 =
  37. 37.Double 32 =
  38. 38.Double 97 =
  39. 39.Half of 178 =
  40. 40.Double 44 =

Answer key

  1. 106
  2. 94
  3. 66
  4. 68
  5. 90
  6. 144
  7. 96
  8. 20
  9. 86
  10. 79
  11. 66
  12. 170
  13. 85
  14. 138
  15. 96
  16. 32
  17. 198
  18. 34
  19. 44
  20. 58
  21. 152
  22. 36
  23. 118
  24. 46
  25. 54
  26. 182
  27. 76
  28. 35
  29. 86
  30. 42
  31. 43
  32. 130
  33. 108
  34. 122
  35. 82
  36. 116
  37. 64
  38. 194
  39. 89
  40. 88

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