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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 566 · 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. 1.49² =
  2. 2.33² =
  3. 3.95² =
  4. 4.71² =
  5. 5.75² =
  6. 6.89² =
  7. 7.61² =
  8. 8.69² =
  9. 9.39² =
  10. 10.44² =
  11. 11.47² =
  12. 12.59² =
  13. 13.48² =
  14. 14.38² =
  15. 15.57² =
  16. 16.82² =
  17. 17.98² =
  18. 18.73² =
  19. 19.64² =
  20. 20.66² =
  21. 21.45² =
  22. 22.51² =
  23. 23.41² =
  24. 24.91² =
  25. 25.43² =
  26. 26.63² =
  27. 27.53² =
  28. 28.74² =
  29. 29.77² =
  30. 30.58² =
  31. 31.84² =
  32. 32.78² =
  33. 33.56² =
  34. 34.36² =
  35. 35.31² =
  36. 36.81² =
  37. 37.92² =
  38. 38.37² =
  39. 39.87² =
  40. 40.99² =

Answer key

  1. 2401
  2. 1089
  3. 9025
  4. 5041
  5. 5625
  6. 7921
  7. 3721
  8. 4761
  9. 1521
  10. 1936
  11. 2209
  12. 3481
  13. 2304
  14. 1444
  15. 3249
  16. 6724
  17. 9604
  18. 5329
  19. 4096
  20. 4356
  21. 2025
  22. 2601
  23. 1681
  24. 8281
  25. 1849
  26. 3969
  27. 2809
  28. 5476
  29. 5929
  30. 3364
  31. 7056
  32. 6084
  33. 3136
  34. 1296
  35. 961
  36. 6561
  37. 8464
  38. 1369
  39. 7569
  40. 9801

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