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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 752 · 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. 1.76² =
  2. 2.97² =
  3. 3.94² =
  4. 4.32² =
  5. 5.34² =
  6. 6.98² =
  7. 7.35² =
  8. 8.61² =
  9. 9.38² =
  10. 10.33² =
  11. 11.52² =
  12. 12.69² =
  13. 13.41² =
  14. 14.89² =
  15. 15.43² =
  16. 16.64² =
  17. 17.68² =
  18. 18.77² =
  19. 19.83² =
  20. 20.48² =
  21. 21.72² =
  22. 22.65² =
  23. 23.56² =
  24. 24.71² =
  25. 25.79² =
  26. 26.99² =
  27. 27.51² =
  28. 28.84² =
  29. 29.49² =
  30. 30.36² =
  31. 31.37² =
  32. 32.67² =
  33. 33.55² =
  34. 34.85² =
  35. 35.59² =
  36. 36.58² =
  37. 37.54² =
  38. 38.91² =
  39. 39.81² =
  40. 40.73² =

Answer key

  1. 5776
  2. 9409
  3. 8836
  4. 1024
  5. 1156
  6. 9604
  7. 1225
  8. 3721
  9. 1444
  10. 1089
  11. 2704
  12. 4761
  13. 1681
  14. 7921
  15. 1849
  16. 4096
  17. 4624
  18. 5929
  19. 6889
  20. 2304
  21. 5184
  22. 4225
  23. 3136
  24. 5041
  25. 6241
  26. 9801
  27. 2601
  28. 7056
  29. 2401
  30. 1296
  31. 1369
  32. 4489
  33. 3025
  34. 7225
  35. 3481
  36. 3364
  37. 2916
  38. 8281
  39. 6561
  40. 5329

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