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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 877 · 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 22 =
  2. 2.Double 81 =
  3. 3.Double 99 =
  4. 4.Double 25 =
  5. 5.Double 74 =
  6. 6.Half of 90 =
  7. 7.Half of 92 =
  8. 8.Double 48 =
  9. 9.Half of 74 =
  10. 10.Double 45 =
  11. 11.Half of 188 =
  12. 12.Double 34 =
  13. 13.Double 33 =
  14. 14.Double 63 =
  15. 15.Double 96 =
  16. 16.Half of 140 =
  17. 17.Half of 42 =
  18. 18.Double 79 =
  19. 19.Double 51 =
  20. 20.Double 52 =
  21. 21.Double 36 =
  22. 22.Half of 64 =
  23. 23.Double 73 =
  24. 24.Half of 94 =
  25. 25.Double 35 =
  26. 26.Double 65 =
  27. 27.Half of 182 =
  28. 28.Double 85 =
  29. 29.Half of 68 =
  30. 30.Half of 46 =
  31. 31.Double 88 =
  32. 32.Double 83 =
  33. 33.Half of 190 =
  34. 34.Double 95 =
  35. 35.Half of 194 =
  36. 36.Double 31 =
  37. 37.Half of 196 =
  38. 38.Half of 152 =
  39. 39.Double 23 =
  40. 40.Half of 72 =

Answer key

  1. 44
  2. 162
  3. 198
  4. 50
  5. 148
  6. 45
  7. 46
  8. 96
  9. 37
  10. 90
  11. 94
  12. 68
  13. 66
  14. 126
  15. 192
  16. 70
  17. 21
  18. 158
  19. 102
  20. 104
  21. 72
  22. 32
  23. 146
  24. 47
  25. 70
  26. 130
  27. 91
  28. 170
  29. 34
  30. 23
  31. 176
  32. 166
  33. 95
  34. 190
  35. 97
  36. 62
  37. 98
  38. 76
  39. 46
  40. 36

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