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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 247 · 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. 1.97² =
  2. 2.95² =
  3. 3.87² =
  4. 4.31² =
  5. 5.84² =
  6. 6.89² =
  7. 7.41² =
  8. 8.79² =
  9. 9.38² =
  10. 10.68² =
  11. 11.73² =
  12. 12.59² =
  13. 13.43² =
  14. 14.39² =
  15. 15.42² =
  16. 16.45² =
  17. 17.71² =
  18. 18.48² =
  19. 19.37² =
  20. 20.99² =
  21. 21.54² =
  22. 22.96² =
  23. 23.88² =
  24. 24.74² =
  25. 25.47² =
  26. 26.35² =
  27. 27.64² =
  28. 28.69² =
  29. 29.36² =
  30. 30.62² =
  31. 31.58² =
  32. 32.81² =
  33. 33.32² =
  34. 34.51² =
  35. 35.72² =
  36. 36.77² =
  37. 37.76² =
  38. 38.98² =
  39. 39.55² =
  40. 40.56² =

Answer key

  1. 9409
  2. 9025
  3. 7569
  4. 961
  5. 7056
  6. 7921
  7. 1681
  8. 6241
  9. 1444
  10. 4624
  11. 5329
  12. 3481
  13. 1849
  14. 1521
  15. 1764
  16. 2025
  17. 5041
  18. 2304
  19. 1369
  20. 9801
  21. 2916
  22. 9216
  23. 7744
  24. 5476
  25. 2209
  26. 1225
  27. 4096
  28. 4761
  29. 1296
  30. 3844
  31. 3364
  32. 6561
  33. 1024
  34. 2601
  35. 5184
  36. 5929
  37. 5776
  38. 9604
  39. 3025
  40. 3136

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