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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 119 · 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. 1.66² =
  2. 2.34² =
  3. 3.31² =
  4. 4.59² =
  5. 5.41² =
  6. 6.37² =
  7. 7.92² =
  8. 8.63² =
  9. 9.75² =
  10. 10.99² =
  11. 11.85² =
  12. 12.58² =
  13. 13.79² =
  14. 14.94² =
  15. 15.89² =
  16. 16.91² =
  17. 17.55² =
  18. 18.73² =
  19. 19.49² =
  20. 20.33² =
  21. 21.39² =
  22. 22.97² =
  23. 23.88² =
  24. 24.74² =
  25. 25.45² =
  26. 26.98² =
  27. 27.69² =
  28. 28.86² =
  29. 29.96² =
  30. 30.95² =
  31. 31.87² =
  32. 32.72² =
  33. 33.83² =
  34. 34.54² =
  35. 35.71² =
  36. 36.43² =
  37. 37.35² =
  38. 38.52² =
  39. 39.44² =
  40. 40.42² =

Answer key

  1. 4356
  2. 1156
  3. 961
  4. 3481
  5. 1681
  6. 1369
  7. 8464
  8. 3969
  9. 5625
  10. 9801
  11. 7225
  12. 3364
  13. 6241
  14. 8836
  15. 7921
  16. 8281
  17. 3025
  18. 5329
  19. 2401
  20. 1089
  21. 1521
  22. 9409
  23. 7744
  24. 5476
  25. 2025
  26. 9604
  27. 4761
  28. 7396
  29. 9216
  30. 9025
  31. 7569
  32. 5184
  33. 6889
  34. 2916
  35. 5041
  36. 1849
  37. 1225
  38. 2704
  39. 1936
  40. 1764

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