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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 659 · 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. 1.32² =
  2. 2.75² =
  3. 3.99² =
  4. 4.91² =
  5. 5.97² =
  6. 6.55² =
  7. 7.67² =
  8. 8.47² =
  9. 9.81² =
  10. 10.56² =
  11. 11.98² =
  12. 12.41² =
  13. 13.45² =
  14. 14.63² =
  15. 15.57² =
  16. 16.71² =
  17. 17.38² =
  18. 18.48² =
  19. 19.68² =
  20. 20.65² =
  21. 21.82² =
  22. 22.44² =
  23. 23.87² =
  24. 24.72² =
  25. 25.51² =
  26. 26.84² =
  27. 27.86² =
  28. 28.79² =
  29. 29.35² =
  30. 30.37² =
  31. 31.39² =
  32. 32.66² =
  33. 33.34² =
  34. 34.62² =
  35. 35.33² =
  36. 36.77² =
  37. 37.36² =
  38. 38.53² =
  39. 39.31² =
  40. 40.69² =

Answer key

  1. 1024
  2. 5625
  3. 9801
  4. 8281
  5. 9409
  6. 3025
  7. 4489
  8. 2209
  9. 6561
  10. 3136
  11. 9604
  12. 1681
  13. 2025
  14. 3969
  15. 3249
  16. 5041
  17. 1444
  18. 2304
  19. 4624
  20. 4225
  21. 6724
  22. 1936
  23. 7569
  24. 5184
  25. 2601
  26. 7056
  27. 7396
  28. 6241
  29. 1225
  30. 1369
  31. 1521
  32. 4356
  33. 1156
  34. 3844
  35. 1089
  36. 5929
  37. 1296
  38. 2809
  39. 961
  40. 4761

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