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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 177 · 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. 1.94² =
  2. 2.66² =
  3. 3.45² =
  4. 4.43² =
  5. 5.82² =
  6. 6.47² =
  7. 7.97² =
  8. 8.41² =
  9. 9.34² =
  10. 10.58² =
  11. 11.32² =
  12. 12.49² =
  13. 13.99² =
  14. 14.87² =
  15. 15.44² =
  16. 16.98² =
  17. 17.56² =
  18. 18.76² =
  19. 19.86² =
  20. 20.53² =
  21. 21.71² =
  22. 22.85² =
  23. 23.93² =
  24. 24.81² =
  25. 25.52² =
  26. 26.91² =
  27. 27.39² =
  28. 28.78² =
  29. 29.59² =
  30. 30.33² =
  31. 31.55² =
  32. 32.96² =
  33. 33.84² =
  34. 34.35² =
  35. 35.73² =
  36. 36.51² =
  37. 37.92² =
  38. 38.31² =
  39. 39.79² =
  40. 40.37² =

Answer key

  1. 8836
  2. 4356
  3. 2025
  4. 1849
  5. 6724
  6. 2209
  7. 9409
  8. 1681
  9. 1156
  10. 3364
  11. 1024
  12. 2401
  13. 9801
  14. 7569
  15. 1936
  16. 9604
  17. 3136
  18. 5776
  19. 7396
  20. 2809
  21. 5041
  22. 7225
  23. 8649
  24. 6561
  25. 2704
  26. 8281
  27. 1521
  28. 6084
  29. 3481
  30. 1089
  31. 3025
  32. 9216
  33. 7056
  34. 1225
  35. 5329
  36. 2601
  37. 8464
  38. 961
  39. 6241
  40. 1369

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