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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 636 · 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. 1.62² =
  2. 2.35² =
  3. 3.85² =
  4. 4.41² =
  5. 5.69² =
  6. 6.91² =
  7. 7.49² =
  8. 8.88² =
  9. 9.59² =
  10. 10.84² =
  11. 11.79² =
  12. 12.38² =
  13. 13.37² =
  14. 14.71² =
  15. 15.51² =
  16. 16.32² =
  17. 17.87² =
  18. 18.61² =
  19. 19.98² =
  20. 20.77² =
  21. 21.64² =
  22. 22.73² =
  23. 23.31² =
  24. 24.46² =
  25. 25.43² =
  26. 26.96² =
  27. 27.86² =
  28. 28.65² =
  29. 29.81² =
  30. 30.48² =
  31. 31.34² =
  32. 32.68² =
  33. 33.47² =
  34. 34.52² =
  35. 35.99² =
  36. 36.75² =
  37. 37.39² =
  38. 38.97² =
  39. 39.83² =
  40. 40.76² =

Answer key

  1. 3844
  2. 1225
  3. 7225
  4. 1681
  5. 4761
  6. 8281
  7. 2401
  8. 7744
  9. 3481
  10. 7056
  11. 6241
  12. 1444
  13. 1369
  14. 5041
  15. 2601
  16. 1024
  17. 7569
  18. 3721
  19. 9604
  20. 5929
  21. 4096
  22. 5329
  23. 961
  24. 2116
  25. 1849
  26. 9216
  27. 7396
  28. 4225
  29. 6561
  30. 2304
  31. 1156
  32. 4624
  33. 2209
  34. 2704
  35. 9801
  36. 5625
  37. 1521
  38. 9409
  39. 6889
  40. 5776

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