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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 232 · 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. 1.84² =
  2. 2.34² =
  3. 3.41² =
  4. 4.82² =
  5. 5.78² =
  6. 6.97² =
  7. 7.96² =
  8. 8.76² =
  9. 9.62² =
  10. 10.46² =
  11. 11.59² =
  12. 12.48² =
  13. 13.67² =
  14. 14.36² =
  15. 15.52² =
  16. 16.32² =
  17. 17.98² =
  18. 18.37² =
  19. 19.69² =
  20. 20.79² =
  21. 21.33² =
  22. 22.56² =
  23. 23.55² =
  24. 24.85² =
  25. 25.77² =
  26. 26.81² =
  27. 27.35² =
  28. 28.68² =
  29. 29.51² =
  30. 30.61² =
  31. 31.99² =
  32. 32.42² =
  33. 33.91² =
  34. 34.31² =
  35. 35.49² =
  36. 36.71² =
  37. 37.83² =
  38. 38.47² =
  39. 39.88² =
  40. 40.53² =

Answer key

  1. 7056
  2. 1156
  3. 1681
  4. 6724
  5. 6084
  6. 9409
  7. 9216
  8. 5776
  9. 3844
  10. 2116
  11. 3481
  12. 2304
  13. 4489
  14. 1296
  15. 2704
  16. 1024
  17. 9604
  18. 1369
  19. 4761
  20. 6241
  21. 1089
  22. 3136
  23. 3025
  24. 7225
  25. 5929
  26. 6561
  27. 1225
  28. 4624
  29. 2601
  30. 3721
  31. 9801
  32. 1764
  33. 8281
  34. 961
  35. 2401
  36. 5041
  37. 6889
  38. 2209
  39. 7744
  40. 2809

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