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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 954 · 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 44 =
  2. 2.Half of 50 =
  3. 3.Double 57 =
  4. 4.Double 34 =
  5. 5.Half of 178 =
  6. 6.Double 27 =
  7. 7.Half of 190 =
  8. 8.Double 47 =
  9. 9.Half of 68 =
  10. 10.Double 29 =
  11. 11.Double 76 =
  12. 12.Half of 164 =
  13. 13.Half of 42 =
  14. 14.Half of 96 =
  15. 15.Double 28 =
  16. 16.Double 88 =
  17. 17.Half of 88 =
  18. 18.Half of 124 =
  19. 19.Double 42 =
  20. 20.Double 89 =
  21. 21.Double 99 =
  22. 22.Half of 120 =
  23. 23.Double 33 =
  24. 24.Double 98 =
  25. 25.Half of 104 =
  26. 26.Half of 170 =
  27. 27.Double 26 =
  28. 28.Double 63 =
  29. 29.Double 61 =
  30. 30.Double 97 =
  31. 31.Half of 188 =
  32. 32.Half of 146 =
  33. 33.Double 51 =
  34. 34.Double 65 =
  35. 35.Double 32 =
  36. 36.Double 52 =
  37. 37.Double 31 =
  38. 38.Double 36 =
  39. 39.Half of 166 =
  40. 40.Half of 40 =

Answer key

  1. 22
  2. 25
  3. 114
  4. 68
  5. 89
  6. 54
  7. 95
  8. 94
  9. 34
  10. 58
  11. 152
  12. 82
  13. 21
  14. 48
  15. 56
  16. 176
  17. 44
  18. 62
  19. 84
  20. 178
  21. 198
  22. 60
  23. 66
  24. 196
  25. 52
  26. 85
  27. 52
  28. 126
  29. 122
  30. 194
  31. 94
  32. 73
  33. 102
  34. 130
  35. 64
  36. 104
  37. 62
  38. 72
  39. 83
  40. 20

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