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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 153 · 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. 1.91² =
  2. 2.38² =
  3. 3.71² =
  4. 4.61² =
  5. 5.76² =
  6. 6.98² =
  7. 7.42² =
  8. 8.48² =
  9. 9.96² =
  10. 10.73² =
  11. 11.86² =
  12. 12.32² =
  13. 13.63² =
  14. 14.85² =
  15. 15.43² =
  16. 16.44² =
  17. 17.88² =
  18. 18.41² =
  19. 19.35² =
  20. 20.36² =
  21. 21.69² =
  22. 22.84² =
  23. 23.89² =
  24. 24.64² =
  25. 25.82² =
  26. 26.99² =
  27. 27.59² =
  28. 28.49² =
  29. 29.56² =
  30. 30.81² =
  31. 31.52² =
  32. 32.65² =
  33. 33.79² =
  34. 34.97² =
  35. 35.33² =
  36. 36.66² =
  37. 37.78² =
  38. 38.57² =
  39. 39.53² =
  40. 40.55² =

Answer key

  1. 8281
  2. 1444
  3. 5041
  4. 3721
  5. 5776
  6. 9604
  7. 1764
  8. 2304
  9. 9216
  10. 5329
  11. 7396
  12. 1024
  13. 3969
  14. 7225
  15. 1849
  16. 1936
  17. 7744
  18. 1681
  19. 1225
  20. 1296
  21. 4761
  22. 7056
  23. 7921
  24. 4096
  25. 6724
  26. 9801
  27. 3481
  28. 2401
  29. 3136
  30. 6561
  31. 2704
  32. 4225
  33. 6241
  34. 9409
  35. 1089
  36. 4356
  37. 6084
  38. 3249
  39. 2809
  40. 3025

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