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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 411 · 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. 1.77² =
  2. 2.71² =
  3. 3.94² =
  4. 4.56² =
  5. 5.48² =
  6. 6.99² =
  7. 7.51² =
  8. 8.66² =
  9. 9.31² =
  10. 10.47² =
  11. 11.81² =
  12. 12.92² =
  13. 13.46² =
  14. 14.83² =
  15. 15.45² =
  16. 16.87² =
  17. 17.97² =
  18. 18.35² =
  19. 19.37² =
  20. 20.38² =
  21. 21.49² =
  22. 22.98² =
  23. 23.32² =
  24. 24.72² =
  25. 25.55² =
  26. 26.58² =
  27. 27.91² =
  28. 28.54² =
  29. 29.44² =
  30. 30.84² =
  31. 31.82² =
  32. 32.63² =
  33. 33.96² =
  34. 34.79² =
  35. 35.75² =
  36. 36.62² =
  37. 37.86² =
  38. 38.61² =
  39. 39.59² =
  40. 40.41² =

Answer key

  1. 5929
  2. 5041
  3. 8836
  4. 3136
  5. 2304
  6. 9801
  7. 2601
  8. 4356
  9. 961
  10. 2209
  11. 6561
  12. 8464
  13. 2116
  14. 6889
  15. 2025
  16. 7569
  17. 9409
  18. 1225
  19. 1369
  20. 1444
  21. 2401
  22. 9604
  23. 1024
  24. 5184
  25. 3025
  26. 3364
  27. 8281
  28. 2916
  29. 1936
  30. 7056
  31. 6724
  32. 3969
  33. 9216
  34. 6241
  35. 5625
  36. 3844
  37. 7396
  38. 3721
  39. 3481
  40. 1681

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