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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 69 · 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. 1.55² =
  2. 2.33² =
  3. 3.43² =
  4. 4.35² =
  5. 5.42² =
  6. 6.82² =
  7. 7.58² =
  8. 8.71² =
  9. 9.34² =
  10. 10.74² =
  11. 11.98² =
  12. 12.53² =
  13. 13.49² =
  14. 14.91² =
  15. 15.39² =
  16. 16.59² =
  17. 17.87² =
  18. 18.79² =
  19. 19.52² =
  20. 20.89² =
  21. 21.93² =
  22. 22.65² =
  23. 23.62² =
  24. 24.61² =
  25. 25.75² =
  26. 26.51² =
  27. 27.97² =
  28. 28.36² =
  29. 29.83² =
  30. 30.64² =
  31. 31.63² =
  32. 32.67² =
  33. 33.54² =
  34. 34.44² =
  35. 35.66² =
  36. 36.46² =
  37. 37.48² =
  38. 38.84² =
  39. 39.99² =
  40. 40.31² =

Answer key

  1. 3025
  2. 1089
  3. 1849
  4. 1225
  5. 1764
  6. 6724
  7. 3364
  8. 5041
  9. 1156
  10. 5476
  11. 9604
  12. 2809
  13. 2401
  14. 8281
  15. 1521
  16. 3481
  17. 7569
  18. 6241
  19. 2704
  20. 7921
  21. 8649
  22. 4225
  23. 3844
  24. 3721
  25. 5625
  26. 2601
  27. 9409
  28. 1296
  29. 6889
  30. 4096
  31. 3969
  32. 4489
  33. 2916
  34. 1936
  35. 4356
  36. 2116
  37. 2304
  38. 7056
  39. 9801
  40. 961

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