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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 724 · 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. 1.44² =
  2. 2.43² =
  3. 3.47² =
  4. 4.45² =
  5. 5.33² =
  6. 6.89² =
  7. 7.41² =
  8. 8.75² =
  9. 9.79² =
  10. 10.71² =
  11. 11.53² =
  12. 12.61² =
  13. 13.88² =
  14. 14.32² =
  15. 15.69² =
  16. 16.39² =
  17. 17.99² =
  18. 18.46² =
  19. 19.57² =
  20. 20.54² =
  21. 21.31² =
  22. 22.34² =
  23. 23.77² =
  24. 24.97² =
  25. 25.42² =
  26. 26.56² =
  27. 27.36² =
  28. 28.72² =
  29. 29.84² =
  30. 30.94² =
  31. 31.62² =
  32. 32.37² =
  33. 33.76² =
  34. 34.48² =
  35. 35.91² =
  36. 36.83² =
  37. 37.67² =
  38. 38.65² =
  39. 39.64² =
  40. 40.78² =

Answer key

  1. 1936
  2. 1849
  3. 2209
  4. 2025
  5. 1089
  6. 7921
  7. 1681
  8. 5625
  9. 6241
  10. 5041
  11. 2809
  12. 3721
  13. 7744
  14. 1024
  15. 4761
  16. 1521
  17. 9801
  18. 2116
  19. 3249
  20. 2916
  21. 961
  22. 1156
  23. 5929
  24. 9409
  25. 1764
  26. 3136
  27. 1296
  28. 5184
  29. 7056
  30. 8836
  31. 3844
  32. 1369
  33. 5776
  34. 2304
  35. 8281
  36. 6889
  37. 4489
  38. 4225
  39. 4096
  40. 6084

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