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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 841 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.61² =
  2. 2.32² =
  3. 3.51² =
  4. 4.82² =
  5. 5.94² =
  6. 6.41² =
  7. 7.57² =
  8. 8.52² =
  9. 9.47² =
  10. 10.71² =
  11. 11.42² =
  12. 12.68² =
  13. 13.83² =
  14. 14.43² =
  15. 15.54² =
  16. 16.53² =
  17. 17.49² =
  18. 18.33² =
  19. 19.79² =
  20. 20.91² =
  21. 21.81² =
  22. 22.66² =
  23. 23.73² =
  24. 24.36² =
  25. 25.64² =
  26. 26.69² =
  27. 27.96² =
  28. 28.89² =
  29. 29.45² =
  30. 30.88² =
  31. 31.75² =
  32. 32.38² =
  33. 33.48² =
  34. 34.65² =
  35. 35.92² =
  36. 36.98² =
  37. 37.31² =
  38. 38.85² =
  39. 39.35² =
  40. 40.67² =

Answer key

  1. 3721
  2. 1024
  3. 2601
  4. 6724
  5. 8836
  6. 1681
  7. 3249
  8. 2704
  9. 2209
  10. 5041
  11. 1764
  12. 4624
  13. 6889
  14. 1849
  15. 2916
  16. 2809
  17. 2401
  18. 1089
  19. 6241
  20. 8281
  21. 6561
  22. 4356
  23. 5329
  24. 1296
  25. 4096
  26. 4761
  27. 9216
  28. 7921
  29. 2025
  30. 7744
  31. 5625
  32. 1444
  33. 2304
  34. 4225
  35. 8464
  36. 9604
  37. 961
  38. 7225
  39. 1225
  40. 4489

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