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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 483 · 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. 2.95² =
  3. 3.41² =
  4. 4.89² =
  5. 5.34² =
  6. 6.54² =
  7. 7.68² =
  8. 8.78² =
  9. 9.63² =
  10. 10.73² =
  11. 11.94² =
  12. 12.66² =
  13. 13.37² =
  14. 14.61² =
  15. 15.91² =
  16. 16.56² =
  17. 17.82² =
  18. 18.59² =
  19. 19.38² =
  20. 20.96² =
  21. 21.92² =
  22. 22.86² =
  23. 23.47² =
  24. 24.51² =
  25. 25.46² =
  26. 26.32² =
  27. 27.88² =
  28. 28.55² =
  29. 29.69² =
  30. 30.76² =
  31. 31.79² =
  32. 32.64² =
  33. 33.57² =
  34. 34.33² =
  35. 35.45² =
  36. 36.31² =
  37. 37.49² =
  38. 38.36² =
  39. 39.67² =
  40. 40.84² =

Answer key

  1. 6561
  2. 9025
  3. 1681
  4. 7921
  5. 1156
  6. 2916
  7. 4624
  8. 6084
  9. 3969
  10. 5329
  11. 8836
  12. 4356
  13. 1369
  14. 3721
  15. 8281
  16. 3136
  17. 6724
  18. 3481
  19. 1444
  20. 9216
  21. 8464
  22. 7396
  23. 2209
  24. 2601
  25. 2116
  26. 1024
  27. 7744
  28. 3025
  29. 4761
  30. 5776
  31. 6241
  32. 4096
  33. 3249
  34. 1089
  35. 2025
  36. 961
  37. 2401
  38. 1296
  39. 4489
  40. 7056

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