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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 28 · 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. 2.48² =
  3. 3.41² =
  4. 4.53² =
  5. 5.92² =
  6. 6.59² =
  7. 7.51² =
  8. 8.85² =
  9. 9.49² =
  10. 10.42² =
  11. 11.47² =
  12. 12.62² =
  13. 13.84² =
  14. 14.66² =
  15. 15.35² =
  16. 16.89² =
  17. 17.33² =
  18. 18.83² =
  19. 19.94² =
  20. 20.79² =
  21. 21.39² =
  22. 22.88² =
  23. 23.98² =
  24. 24.44² =
  25. 25.56² =
  26. 26.31² =
  27. 27.82² =
  28. 28.69² =
  29. 29.37² =
  30. 30.96² =
  31. 31.86² =
  32. 32.34² =
  33. 33.63² =
  34. 34.64² =
  35. 35.99² =
  36. 36.61² =
  37. 37.71² =
  38. 38.67² =
  39. 39.91² =
  40. 40.97² =

Answer key

  1. 1024
  2. 2304
  3. 1681
  4. 2809
  5. 8464
  6. 3481
  7. 2601
  8. 7225
  9. 2401
  10. 1764
  11. 2209
  12. 3844
  13. 7056
  14. 4356
  15. 1225
  16. 7921
  17. 1089
  18. 6889
  19. 8836
  20. 6241
  21. 1521
  22. 7744
  23. 9604
  24. 1936
  25. 3136
  26. 961
  27. 6724
  28. 4761
  29. 1369
  30. 9216
  31. 7396
  32. 1156
  33. 3969
  34. 4096
  35. 9801
  36. 3721
  37. 5041
  38. 4489
  39. 8281
  40. 9409

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