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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 2 · 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. 1.88² =
  2. 2.69² =
  3. 3.87² =
  4. 4.96² =
  5. 5.81² =
  6. 6.58² =
  7. 7.76² =
  8. 8.75² =
  9. 9.38² =
  10. 10.97² =
  11. 11.94² =
  12. 12.39² =
  13. 13.41² =
  14. 14.45² =
  15. 15.71² =
  16. 16.64² =
  17. 17.73² =
  18. 18.62² =
  19. 19.61² =
  20. 20.37² =
  21. 21.44² =
  22. 22.35² =
  23. 23.78² =
  24. 24.82² =
  25. 25.89² =
  26. 26.95² =
  27. 27.46² =
  28. 28.83² =
  29. 29.67² =
  30. 30.56² =
  31. 31.47² =
  32. 32.74² =
  33. 33.48² =
  34. 34.77² =
  35. 35.31² =
  36. 36.36² =
  37. 37.43² =
  38. 38.63² =
  39. 39.33² =
  40. 40.57² =

Answer key

  1. 7744
  2. 4761
  3. 7569
  4. 9216
  5. 6561
  6. 3364
  7. 5776
  8. 5625
  9. 1444
  10. 9409
  11. 8836
  12. 1521
  13. 1681
  14. 2025
  15. 5041
  16. 4096
  17. 5329
  18. 3844
  19. 3721
  20. 1369
  21. 1936
  22. 1225
  23. 6084
  24. 6724
  25. 7921
  26. 9025
  27. 2116
  28. 6889
  29. 4489
  30. 3136
  31. 2209
  32. 5476
  33. 2304
  34. 5929
  35. 961
  36. 1296
  37. 1849
  38. 3969
  39. 1089
  40. 3249

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