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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 980 · 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 150 =
  2. 2.Double 36 =
  3. 3.Double 19 =
  4. 4.Half of 190 =
  5. 5.Double 22 =
  6. 6.Half of 102 =
  7. 7.Half of 172 =
  8. 8.Double 65 =
  9. 9.Double 95 =
  10. 10.Double 24 =
  11. 11.Half of 92 =
  12. 12.Half of 26 =
  13. 13.Double 37 =
  14. 14.Double 27 =
  15. 15.Half of 86 =
  16. 16.Double 58 =
  17. 17.Half of 56 =
  18. 18.Half of 116 =
  19. 19.Half of 132 =
  20. 20.Double 57 =
  21. 21.Double 99 =
  22. 22.Half of 114 =
  23. 23.Double 28 =
  24. 24.Half of 140 =
  25. 25.Half of 156 =
  26. 26.Half of 126 =
  27. 27.Half of 28 =
  28. 28.Half of 46 =
  29. 29.Double 46 =
  30. 30.Half of 182 =
  31. 31.Half of 72 =
  32. 32.Double 89 =
  33. 33.Double 96 =
  34. 34.Double 32 =
  35. 35.Half of 30 =
  36. 36.Half of 98 =
  37. 37.Double 48 =
  38. 38.Half of 64 =
  39. 39.Double 38 =
  40. 40.Half of 148 =

Answer key

  1. 75
  2. 72
  3. 38
  4. 95
  5. 44
  6. 51
  7. 86
  8. 130
  9. 190
  10. 48
  11. 46
  12. 13
  13. 74
  14. 54
  15. 43
  16. 116
  17. 28
  18. 58
  19. 66
  20. 114
  21. 198
  22. 57
  23. 56
  24. 70
  25. 78
  26. 63
  27. 14
  28. 23
  29. 92
  30. 91
  31. 36
  32. 178
  33. 192
  34. 64
  35. 15
  36. 49
  37. 96
  38. 32
  39. 76
  40. 74

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