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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 170 · 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. 1.87² =
  2. 2.47² =
  3. 3.42² =
  4. 4.32² =
  5. 5.62² =
  6. 6.44² =
  7. 7.66² =
  8. 8.88² =
  9. 9.36² =
  10. 10.78² =
  11. 11.82² =
  12. 12.65² =
  13. 13.43² =
  14. 14.68² =
  15. 15.53² =
  16. 16.99² =
  17. 17.85² =
  18. 18.55² =
  19. 19.45² =
  20. 20.63² =
  21. 21.58² =
  22. 22.97² =
  23. 23.64² =
  24. 24.48² =
  25. 25.41² =
  26. 26.67² =
  27. 27.75² =
  28. 28.69² =
  29. 29.57² =
  30. 30.35² =
  31. 31.61² =
  32. 32.54² =
  33. 33.46² =
  34. 34.39² =
  35. 35.81² =
  36. 36.98² =
  37. 37.34² =
  38. 38.56² =
  39. 39.59² =
  40. 40.76² =

Answer key

  1. 7569
  2. 2209
  3. 1764
  4. 1024
  5. 3844
  6. 1936
  7. 4356
  8. 7744
  9. 1296
  10. 6084
  11. 6724
  12. 4225
  13. 1849
  14. 4624
  15. 2809
  16. 9801
  17. 7225
  18. 3025
  19. 2025
  20. 3969
  21. 3364
  22. 9409
  23. 4096
  24. 2304
  25. 1681
  26. 4489
  27. 5625
  28. 4761
  29. 3249
  30. 1225
  31. 3721
  32. 2916
  33. 2116
  34. 1521
  35. 6561
  36. 9604
  37. 1156
  38. 3136
  39. 3481
  40. 5776

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