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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 808 · 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. 1.41² =
  2. 2.39² =
  3. 3.51² =
  4. 4.56² =
  5. 5.89² =
  6. 6.93² =
  7. 7.79² =
  8. 8.44² =
  9. 9.78² =
  10. 10.61² =
  11. 11.81² =
  12. 12.59² =
  13. 13.66² =
  14. 14.33² =
  15. 15.82² =
  16. 16.83² =
  17. 17.46² =
  18. 18.95² =
  19. 19.71² =
  20. 20.48² =
  21. 21.85² =
  22. 22.64² =
  23. 23.69² =
  24. 24.47² =
  25. 25.72² =
  26. 26.35² =
  27. 27.53² =
  28. 28.62² =
  29. 29.38² =
  30. 30.75² =
  31. 31.54² =
  32. 32.36² =
  33. 33.88² =
  34. 34.92² =
  35. 35.91² =
  36. 36.73² =
  37. 37.58² =
  38. 38.52² =
  39. 39.45² =
  40. 40.94² =

Answer key

  1. 1681
  2. 1521
  3. 2601
  4. 3136
  5. 7921
  6. 8649
  7. 6241
  8. 1936
  9. 6084
  10. 3721
  11. 6561
  12. 3481
  13. 4356
  14. 1089
  15. 6724
  16. 6889
  17. 2116
  18. 9025
  19. 5041
  20. 2304
  21. 7225
  22. 4096
  23. 4761
  24. 2209
  25. 5184
  26. 1225
  27. 2809
  28. 3844
  29. 1444
  30. 5625
  31. 2916
  32. 1296
  33. 7744
  34. 8464
  35. 8281
  36. 5329
  37. 3364
  38. 2704
  39. 2025
  40. 8836

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