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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 651 · 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. 1.41² =
  2. 2.55² =
  3. 3.78² =
  4. 4.71² =
  5. 5.57² =
  6. 6.99² =
  7. 7.35² =
  8. 8.43² =
  9. 9.69² =
  10. 10.76² =
  11. 11.34² =
  12. 12.62² =
  13. 13.68² =
  14. 14.44² =
  15. 15.37² =
  16. 16.31² =
  17. 17.46² =
  18. 18.64² =
  19. 19.93² =
  20. 20.45² =
  21. 21.33² =
  22. 22.95² =
  23. 23.32² =
  24. 24.61² =
  25. 25.53² =
  26. 26.65² =
  27. 27.96² =
  28. 28.49² =
  29. 29.39² =
  30. 30.74² =
  31. 31.86² =
  32. 32.63² =
  33. 33.47² =
  34. 34.87² =
  35. 35.66² =
  36. 36.67² =
  37. 37.98² =
  38. 38.85² =
  39. 39.54² =
  40. 40.56² =

Answer key

  1. 1681
  2. 3025
  3. 6084
  4. 5041
  5. 3249
  6. 9801
  7. 1225
  8. 1849
  9. 4761
  10. 5776
  11. 1156
  12. 3844
  13. 4624
  14. 1936
  15. 1369
  16. 961
  17. 2116
  18. 4096
  19. 8649
  20. 2025
  21. 1089
  22. 9025
  23. 1024
  24. 3721
  25. 2809
  26. 4225
  27. 9216
  28. 2401
  29. 1521
  30. 5476
  31. 7396
  32. 3969
  33. 2209
  34. 7569
  35. 4356
  36. 4489
  37. 9604
  38. 7225
  39. 2916
  40. 3136

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