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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 658 · 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. 1.38² =
  2. 2.91² =
  3. 3.58² =
  4. 4.68² =
  5. 5.56² =
  6. 6.72² =
  7. 7.67² =
  8. 8.37² =
  9. 9.82² =
  10. 10.54² =
  11. 11.95² =
  12. 12.41² =
  13. 13.74² =
  14. 14.42² =
  15. 15.53² =
  16. 16.31² =
  17. 17.33² =
  18. 18.39² =
  19. 19.55² =
  20. 20.94² =
  21. 21.81² =
  22. 22.76² =
  23. 23.73² =
  24. 24.88² =
  25. 25.64² =
  26. 26.45² =
  27. 27.61² =
  28. 28.66² =
  29. 29.62² =
  30. 30.44² =
  31. 31.71² =
  32. 32.34² =
  33. 33.46² =
  34. 34.65² =
  35. 35.69² =
  36. 36.98² =
  37. 37.35² =
  38. 38.63² =
  39. 39.57² =
  40. 40.78² =

Answer key

  1. 1444
  2. 8281
  3. 3364
  4. 4624
  5. 3136
  6. 5184
  7. 4489
  8. 1369
  9. 6724
  10. 2916
  11. 9025
  12. 1681
  13. 5476
  14. 1764
  15. 2809
  16. 961
  17. 1089
  18. 1521
  19. 3025
  20. 8836
  21. 6561
  22. 5776
  23. 5329
  24. 7744
  25. 4096
  26. 2025
  27. 3721
  28. 4356
  29. 3844
  30. 1936
  31. 5041
  32. 1156
  33. 2116
  34. 4225
  35. 4761
  36. 9604
  37. 1225
  38. 3969
  39. 3249
  40. 6084

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