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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 53 · 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. 1.39² =
  2. 2.58² =
  3. 3.34² =
  4. 4.72² =
  5. 5.91² =
  6. 6.51² =
  7. 7.95² =
  8. 8.97² =
  9. 9.32² =
  10. 10.46² =
  11. 11.99² =
  12. 12.94² =
  13. 13.73² =
  14. 14.44² =
  15. 15.71² =
  16. 16.81² =
  17. 17.33² =
  18. 18.48² =
  19. 19.41² =
  20. 20.84² =
  21. 21.45² =
  22. 22.75² =
  23. 23.47² =
  24. 24.87² =
  25. 25.79² =
  26. 26.69² =
  27. 27.64² =
  28. 28.77² =
  29. 29.62² =
  30. 30.68² =
  31. 31.57² =
  32. 32.89² =
  33. 33.35² =
  34. 34.37² =
  35. 35.83² =
  36. 36.92² =
  37. 37.53² =
  38. 38.43² =
  39. 39.85² =
  40. 40.78² =

Answer key

  1. 1521
  2. 3364
  3. 1156
  4. 5184
  5. 8281
  6. 2601
  7. 9025
  8. 9409
  9. 1024
  10. 2116
  11. 9801
  12. 8836
  13. 5329
  14. 1936
  15. 5041
  16. 6561
  17. 1089
  18. 2304
  19. 1681
  20. 7056
  21. 2025
  22. 5625
  23. 2209
  24. 7569
  25. 6241
  26. 4761
  27. 4096
  28. 5929
  29. 3844
  30. 4624
  31. 3249
  32. 7921
  33. 1225
  34. 1369
  35. 6889
  36. 8464
  37. 2809
  38. 1849
  39. 7225
  40. 6084

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