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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 550 · 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. 1.41² =
  2. 2.45² =
  3. 3.63² =
  4. 4.96² =
  5. 5.71² =
  6. 6.92² =
  7. 7.98² =
  8. 8.35² =
  9. 9.53² =
  10. 10.31² =
  11. 11.76² =
  12. 12.83² =
  13. 13.59² =
  14. 14.65² =
  15. 15.48² =
  16. 16.33² =
  17. 17.93² =
  18. 18.85² =
  19. 19.75² =
  20. 20.82² =
  21. 21.78² =
  22. 22.84² =
  23. 23.39² =
  24. 24.97² =
  25. 25.47² =
  26. 26.91² =
  27. 27.49² =
  28. 28.64² =
  29. 29.67² =
  30. 30.56² =
  31. 31.86² =
  32. 32.72² =
  33. 33.68² =
  34. 34.79² =
  35. 35.32² =
  36. 36.61² =
  37. 37.74² =
  38. 38.36² =
  39. 39.88² =
  40. 40.44² =

Answer key

  1. 1681
  2. 2025
  3. 3969
  4. 9216
  5. 5041
  6. 8464
  7. 9604
  8. 1225
  9. 2809
  10. 961
  11. 5776
  12. 6889
  13. 3481
  14. 4225
  15. 2304
  16. 1089
  17. 8649
  18. 7225
  19. 5625
  20. 6724
  21. 6084
  22. 7056
  23. 1521
  24. 9409
  25. 2209
  26. 8281
  27. 2401
  28. 4096
  29. 4489
  30. 3136
  31. 7396
  32. 5184
  33. 4624
  34. 6241
  35. 1024
  36. 3721
  37. 5476
  38. 1296
  39. 7744
  40. 1936

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