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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 520 · 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. 1.38² =
  2. 2.95² =
  3. 3.61² =
  4. 4.47² =
  5. 5.56² =
  6. 6.96² =
  7. 7.71² =
  8. 8.48² =
  9. 9.55² =
  10. 10.64² =
  11. 11.83² =
  12. 12.84² =
  13. 13.43² =
  14. 14.65² =
  15. 15.78² =
  16. 16.42² =
  17. 17.98² =
  18. 18.94² =
  19. 19.81² =
  20. 20.35² =
  21. 21.77² =
  22. 22.36² =
  23. 23.59² =
  24. 24.97² =
  25. 25.86² =
  26. 26.85² =
  27. 27.46² =
  28. 28.99² =
  29. 29.89² =
  30. 30.67² =
  31. 31.49² =
  32. 32.88² =
  33. 33.39² =
  34. 34.51² =
  35. 35.75² =
  36. 36.68² =
  37. 37.33² =
  38. 38.94² =
  39. 39.53² =
  40. 40.82² =

Answer key

  1. 1444
  2. 9025
  3. 3721
  4. 2209
  5. 3136
  6. 9216
  7. 5041
  8. 2304
  9. 3025
  10. 4096
  11. 6889
  12. 7056
  13. 1849
  14. 4225
  15. 6084
  16. 1764
  17. 9604
  18. 8836
  19. 6561
  20. 1225
  21. 5929
  22. 1296
  23. 3481
  24. 9409
  25. 7396
  26. 7225
  27. 2116
  28. 9801
  29. 7921
  30. 4489
  31. 2401
  32. 7744
  33. 1521
  34. 2601
  35. 5625
  36. 4624
  37. 1089
  38. 8836
  39. 2809
  40. 6724

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