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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 171 · 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. 1.54² =
  2. 2.41² =
  3. 3.68² =
  4. 4.66² =
  5. 5.73² =
  6. 6.38² =
  7. 7.98² =
  8. 8.63² =
  9. 9.83² =
  10. 10.48² =
  11. 11.64² =
  12. 12.82² =
  13. 13.87² =
  14. 14.52² =
  15. 15.86² =
  16. 16.51² =
  17. 17.81² =
  18. 18.37² =
  19. 19.76² =
  20. 20.46² =
  21. 21.47² =
  22. 22.69² =
  23. 23.67² =
  24. 24.71² =
  25. 25.74² =
  26. 26.91² =
  27. 27.92² =
  28. 28.32² =
  29. 29.59² =
  30. 30.53² =
  31. 31.61² =
  32. 32.62² =
  33. 33.49² =
  34. 34.77² =
  35. 35.89² =
  36. 36.43² =
  37. 37.96² =
  38. 38.78² =
  39. 39.44² =
  40. 40.94² =

Answer key

  1. 2916
  2. 1681
  3. 4624
  4. 4356
  5. 5329
  6. 1444
  7. 9604
  8. 3969
  9. 6889
  10. 2304
  11. 4096
  12. 6724
  13. 7569
  14. 2704
  15. 7396
  16. 2601
  17. 6561
  18. 1369
  19. 5776
  20. 2116
  21. 2209
  22. 4761
  23. 4489
  24. 5041
  25. 5476
  26. 8281
  27. 8464
  28. 1024
  29. 3481
  30. 2809
  31. 3721
  32. 3844
  33. 2401
  34. 5929
  35. 7921
  36. 1849
  37. 9216
  38. 6084
  39. 1936
  40. 8836

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