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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 18 · 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. 1.81² =
  2. 2.43² =
  3. 3.36² =
  4. 4.58² =
  5. 5.76² =
  6. 6.44² =
  7. 7.74² =
  8. 8.68² =
  9. 9.57² =
  10. 10.97² =
  11. 11.41² =
  12. 12.85² =
  13. 13.52² =
  14. 14.66² =
  15. 15.65² =
  16. 16.47² =
  17. 17.42² =
  18. 18.73² =
  19. 19.86² =
  20. 20.79² =
  21. 21.62² =
  22. 22.71² =
  23. 23.38² =
  24. 24.91² =
  25. 25.35² =
  26. 26.89² =
  27. 27.98² =
  28. 28.72² =
  29. 29.45² =
  30. 30.34² =
  31. 31.99² =
  32. 32.84² =
  33. 33.53² =
  34. 34.67² =
  35. 35.32² =
  36. 36.95² =
  37. 37.61² =
  38. 38.49² =
  39. 39.88² =
  40. 40.78² =

Answer key

  1. 6561
  2. 1849
  3. 1296
  4. 3364
  5. 5776
  6. 1936
  7. 5476
  8. 4624
  9. 3249
  10. 9409
  11. 1681
  12. 7225
  13. 2704
  14. 4356
  15. 4225
  16. 2209
  17. 1764
  18. 5329
  19. 7396
  20. 6241
  21. 3844
  22. 5041
  23. 1444
  24. 8281
  25. 1225
  26. 7921
  27. 9604
  28. 5184
  29. 2025
  30. 1156
  31. 9801
  32. 7056
  33. 2809
  34. 4489
  35. 1024
  36. 9025
  37. 3721
  38. 2401
  39. 7744
  40. 6084

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