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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 851 · 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. 1.48² =
  2. 2.97² =
  3. 3.41² =
  4. 4.44² =
  5. 5.81² =
  6. 6.31² =
  7. 7.42² =
  8. 8.76² =
  9. 9.46² =
  10. 10.47² =
  11. 11.74² =
  12. 12.33² =
  13. 13.61² =
  14. 14.87² =
  15. 15.91² =
  16. 16.71² =
  17. 17.99² =
  18. 18.43² =
  19. 19.72² =
  20. 20.78² =
  21. 21.55² =
  22. 22.36² =
  23. 23.57² =
  24. 24.69² =
  25. 25.85² =
  26. 26.94² =
  27. 27.39² =
  28. 28.95² =
  29. 29.63² =
  30. 30.37² =
  31. 31.45² =
  32. 32.73² =
  33. 33.65² =
  34. 34.38² =
  35. 35.66² =
  36. 36.35² =
  37. 37.49² =
  38. 38.68² =
  39. 39.32² =
  40. 40.96² =

Answer key

  1. 2304
  2. 9409
  3. 1681
  4. 1936
  5. 6561
  6. 961
  7. 1764
  8. 5776
  9. 2116
  10. 2209
  11. 5476
  12. 1089
  13. 3721
  14. 7569
  15. 8281
  16. 5041
  17. 9801
  18. 1849
  19. 5184
  20. 6084
  21. 3025
  22. 1296
  23. 3249
  24. 4761
  25. 7225
  26. 8836
  27. 1521
  28. 9025
  29. 3969
  30. 1369
  31. 2025
  32. 5329
  33. 4225
  34. 1444
  35. 4356
  36. 1225
  37. 2401
  38. 4624
  39. 1024
  40. 9216

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