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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 382 · 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. 1.97² =
  2. 2.41² =
  3. 3.38² =
  4. 4.33² =
  5. 5.89² =
  6. 6.39² =
  7. 7.75² =
  8. 8.81² =
  9. 9.94² =
  10. 10.73² =
  11. 11.79² =
  12. 12.36² =
  13. 13.69² =
  14. 14.98² =
  15. 15.77² =
  16. 16.48² =
  17. 17.46² =
  18. 18.32² =
  19. 19.54² =
  20. 20.44² =
  21. 21.45² =
  22. 22.37² =
  23. 23.71² =
  24. 24.96² =
  25. 25.64² =
  26. 26.43² =
  27. 27.72² =
  28. 28.52² =
  29. 29.76² =
  30. 30.99² =
  31. 31.56² =
  32. 32.53² =
  33. 33.87² =
  34. 34.78² =
  35. 35.65² =
  36. 36.82² =
  37. 37.49² =
  38. 38.55² =
  39. 39.57² =
  40. 40.51² =

Answer key

  1. 9409
  2. 1681
  3. 1444
  4. 1089
  5. 7921
  6. 1521
  7. 5625
  8. 6561
  9. 8836
  10. 5329
  11. 6241
  12. 1296
  13. 4761
  14. 9604
  15. 5929
  16. 2304
  17. 2116
  18. 1024
  19. 2916
  20. 1936
  21. 2025
  22. 1369
  23. 5041
  24. 9216
  25. 4096
  26. 1849
  27. 5184
  28. 2704
  29. 5776
  30. 9801
  31. 3136
  32. 2809
  33. 7569
  34. 6084
  35. 4225
  36. 6724
  37. 2401
  38. 3025
  39. 3249
  40. 2601

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