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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 588 · 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. 1.82² =
  2. 2.39² =
  3. 3.87² =
  4. 4.32² =
  5. 5.37² =
  6. 6.46² =
  7. 7.71² =
  8. 8.55² =
  9. 9.31² =
  10. 10.96² =
  11. 11.33² =
  12. 12.44² =
  13. 13.59² =
  14. 14.51² =
  15. 15.76² =
  16. 16.49² =
  17. 17.35² =
  18. 18.88² =
  19. 19.73² =
  20. 20.98² =
  21. 21.43² =
  22. 22.61² =
  23. 23.52² =
  24. 24.41² =
  25. 25.81² =
  26. 26.54² =
  27. 27.67² =
  28. 28.77² =
  29. 29.45² =
  30. 30.69² =
  31. 31.78² =
  32. 32.72² =
  33. 33.58² =
  34. 34.62² =
  35. 35.34² =
  36. 36.97² =
  37. 37.93² =
  38. 38.68² =
  39. 39.84² =
  40. 40.91² =

Answer key

  1. 6724
  2. 1521
  3. 7569
  4. 1024
  5. 1369
  6. 2116
  7. 5041
  8. 3025
  9. 961
  10. 9216
  11. 1089
  12. 1936
  13. 3481
  14. 2601
  15. 5776
  16. 2401
  17. 1225
  18. 7744
  19. 5329
  20. 9604
  21. 1849
  22. 3721
  23. 2704
  24. 1681
  25. 6561
  26. 2916
  27. 4489
  28. 5929
  29. 2025
  30. 4761
  31. 6084
  32. 5184
  33. 3364
  34. 3844
  35. 1156
  36. 9409
  37. 8649
  38. 4624
  39. 7056
  40. 8281

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