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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 374 · 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. 1.45² =
  2. 2.41² =
  3. 3.81² =
  4. 4.88² =
  5. 5.94² =
  6. 6.79² =
  7. 7.87² =
  8. 8.61² =
  9. 9.37² =
  10. 10.62² =
  11. 11.39² =
  12. 12.95² =
  13. 13.31² =
  14. 14.38² =
  15. 15.34² =
  16. 16.84² =
  17. 17.65² =
  18. 18.51² =
  19. 19.71² =
  20. 20.82² =
  21. 21.63² =
  22. 22.86² =
  23. 23.69² =
  24. 24.77² =
  25. 25.98² =
  26. 26.76² =
  27. 27.92² =
  28. 28.73² =
  29. 29.91² =
  30. 30.97² =
  31. 31.46² =
  32. 32.68² =
  33. 33.32² =
  34. 34.67² =
  35. 35.36² =
  36. 36.33² =
  37. 37.59² =
  38. 38.47² =
  39. 39.64² =
  40. 40.66² =

Answer key

  1. 2025
  2. 1681
  3. 6561
  4. 7744
  5. 8836
  6. 6241
  7. 7569
  8. 3721
  9. 1369
  10. 3844
  11. 1521
  12. 9025
  13. 961
  14. 1444
  15. 1156
  16. 7056
  17. 4225
  18. 2601
  19. 5041
  20. 6724
  21. 3969
  22. 7396
  23. 4761
  24. 5929
  25. 9604
  26. 5776
  27. 8464
  28. 5329
  29. 8281
  30. 9409
  31. 2116
  32. 4624
  33. 1024
  34. 4489
  35. 1296
  36. 1089
  37. 3481
  38. 2209
  39. 4096
  40. 4356

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