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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 593 · 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. 1.83² =
  2. 2.62² =
  3. 3.32² =
  4. 4.41² =
  5. 5.95² =
  6. 6.88² =
  7. 7.87² =
  8. 8.69² =
  9. 9.63² =
  10. 10.71² =
  11. 11.96² =
  12. 12.59² =
  13. 13.67² =
  14. 14.43² =
  15. 15.86² =
  16. 16.77² =
  17. 17.73² =
  18. 18.44² =
  19. 19.48² =
  20. 20.66² =
  21. 21.53² =
  22. 22.46² =
  23. 23.72² =
  24. 24.61² =
  25. 25.92² =
  26. 26.79² =
  27. 27.31² =
  28. 28.97² =
  29. 29.84² =
  30. 30.51² =
  31. 31.47² =
  32. 32.58² =
  33. 33.34² =
  34. 34.36² =
  35. 35.33² =
  36. 36.45² =
  37. 37.52² =
  38. 38.89² =
  39. 39.49² =
  40. 40.74² =

Answer key

  1. 6889
  2. 3844
  3. 1024
  4. 1681
  5. 9025
  6. 7744
  7. 7569
  8. 4761
  9. 3969
  10. 5041
  11. 9216
  12. 3481
  13. 4489
  14. 1849
  15. 7396
  16. 5929
  17. 5329
  18. 1936
  19. 2304
  20. 4356
  21. 2809
  22. 2116
  23. 5184
  24. 3721
  25. 8464
  26. 6241
  27. 961
  28. 9409
  29. 7056
  30. 2601
  31. 2209
  32. 3364
  33. 1156
  34. 1296
  35. 1089
  36. 2025
  37. 2704
  38. 7921
  39. 2401
  40. 5476

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