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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 646 · 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. 1.39² =
  2. 2.98² =
  3. 3.33² =
  4. 4.77² =
  5. 5.56² =
  6. 6.71² =
  7. 7.73² =
  8. 8.91² =
  9. 9.68² =
  10. 10.55² =
  11. 11.61² =
  12. 12.62² =
  13. 13.32² =
  14. 14.94² =
  15. 15.41² =
  16. 16.81² =
  17. 17.79² =
  18. 18.84² =
  19. 19.72² =
  20. 20.97² =
  21. 21.92² =
  22. 22.99² =
  23. 23.31² =
  24. 24.83² =
  25. 25.42² =
  26. 26.78² =
  27. 27.53² =
  28. 28.49² =
  29. 29.43² =
  30. 30.86² =
  31. 31.89² =
  32. 32.82² =
  33. 33.51² =
  34. 34.36² =
  35. 35.46² =
  36. 36.87² =
  37. 37.59² =
  38. 38.37² =
  39. 39.88² =
  40. 40.96² =

Answer key

  1. 1521
  2. 9604
  3. 1089
  4. 5929
  5. 3136
  6. 5041
  7. 5329
  8. 8281
  9. 4624
  10. 3025
  11. 3721
  12. 3844
  13. 1024
  14. 8836
  15. 1681
  16. 6561
  17. 6241
  18. 7056
  19. 5184
  20. 9409
  21. 8464
  22. 9801
  23. 961
  24. 6889
  25. 1764
  26. 6084
  27. 2809
  28. 2401
  29. 1849
  30. 7396
  31. 7921
  32. 6724
  33. 2601
  34. 1296
  35. 2116
  36. 7569
  37. 3481
  38. 1369
  39. 7744
  40. 9216

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