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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 591 · 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. 1.71² =
  2. 2.69² =
  3. 3.65² =
  4. 4.45² =
  5. 5.86² =
  6. 6.41² =
  7. 7.89² =
  8. 8.48² =
  9. 9.75² =
  10. 10.53² =
  11. 11.95² =
  12. 12.91² =
  13. 13.83² =
  14. 14.81² =
  15. 15.88² =
  16. 16.79² =
  17. 17.33² =
  18. 18.42² =
  19. 19.55² =
  20. 20.43² =
  21. 21.38² =
  22. 22.56² =
  23. 23.47² =
  24. 24.52² =
  25. 25.85² =
  26. 26.96² =
  27. 27.93² =
  28. 28.99² =
  29. 29.35² =
  30. 30.73² =
  31. 31.94² =
  32. 32.58² =
  33. 33.98² =
  34. 34.39² =
  35. 35.64² =
  36. 36.49² =
  37. 37.82² =
  38. 38.76² =
  39. 39.57² =
  40. 40.62² =

Answer key

  1. 5041
  2. 4761
  3. 4225
  4. 2025
  5. 7396
  6. 1681
  7. 7921
  8. 2304
  9. 5625
  10. 2809
  11. 9025
  12. 8281
  13. 6889
  14. 6561
  15. 7744
  16. 6241
  17. 1089
  18. 1764
  19. 3025
  20. 1849
  21. 1444
  22. 3136
  23. 2209
  24. 2704
  25. 7225
  26. 9216
  27. 8649
  28. 9801
  29. 1225
  30. 5329
  31. 8836
  32. 3364
  33. 9604
  34. 1521
  35. 4096
  36. 2401
  37. 6724
  38. 5776
  39. 3249
  40. 3844

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