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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 206 · 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. 1.37² =
  2. 2.95² =
  3. 3.41² =
  4. 4.58² =
  5. 5.44² =
  6. 6.77² =
  7. 7.81² =
  8. 8.66² =
  9. 9.86² =
  10. 10.61² =
  11. 11.36² =
  12. 12.43² =
  13. 13.76² =
  14. 14.45² =
  15. 15.88² =
  16. 16.46² =
  17. 17.38² =
  18. 18.32² =
  19. 19.48² =
  20. 20.87² =
  21. 21.97² =
  22. 22.55² =
  23. 23.67² =
  24. 24.73² =
  25. 25.63² =
  26. 26.35² =
  27. 27.68² =
  28. 28.99² =
  29. 29.51² =
  30. 30.96² =
  31. 31.72² =
  32. 32.33² =
  33. 33.62² =
  34. 34.39² =
  35. 35.69² =
  36. 36.65² =
  37. 37.78² =
  38. 38.92² =
  39. 39.49² =
  40. 40.71² =

Answer key

  1. 1369
  2. 9025
  3. 1681
  4. 3364
  5. 1936
  6. 5929
  7. 6561
  8. 4356
  9. 7396
  10. 3721
  11. 1296
  12. 1849
  13. 5776
  14. 2025
  15. 7744
  16. 2116
  17. 1444
  18. 1024
  19. 2304
  20. 7569
  21. 9409
  22. 3025
  23. 4489
  24. 5329
  25. 3969
  26. 1225
  27. 4624
  28. 9801
  29. 2601
  30. 9216
  31. 5184
  32. 1089
  33. 3844
  34. 1521
  35. 4761
  36. 4225
  37. 6084
  38. 8464
  39. 2401
  40. 5041

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