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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 447 · 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. 1.65² =
  2. 2.59² =
  3. 3.78² =
  4. 4.45² =
  5. 5.37² =
  6. 6.34² =
  7. 7.54² =
  8. 8.97² =
  9. 9.67² =
  10. 10.81² =
  11. 11.31² =
  12. 12.43² =
  13. 13.77² =
  14. 14.48² =
  15. 15.75² =
  16. 16.95² =
  17. 17.41² =
  18. 18.63² =
  19. 19.74² =
  20. 20.71² =
  21. 21.69² =
  22. 22.39² =
  23. 23.42² =
  24. 24.55² =
  25. 25.58² =
  26. 26.79² =
  27. 27.73² =
  28. 28.56² =
  29. 29.98² =
  30. 30.82² =
  31. 31.96² =
  32. 32.76² =
  33. 33.66² =
  34. 34.32² =
  35. 35.38² =
  36. 36.86² =
  37. 37.53² =
  38. 38.47² =
  39. 39.85² =
  40. 40.46² =

Answer key

  1. 4225
  2. 3481
  3. 6084
  4. 2025
  5. 1369
  6. 1156
  7. 2916
  8. 9409
  9. 4489
  10. 6561
  11. 961
  12. 1849
  13. 5929
  14. 2304
  15. 5625
  16. 9025
  17. 1681
  18. 3969
  19. 5476
  20. 5041
  21. 4761
  22. 1521
  23. 1764
  24. 3025
  25. 3364
  26. 6241
  27. 5329
  28. 3136
  29. 9604
  30. 6724
  31. 9216
  32. 5776
  33. 4356
  34. 1024
  35. 1444
  36. 7396
  37. 2809
  38. 2209
  39. 7225
  40. 2116

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