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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 377 · 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. 1.38² =
  2. 2.47² =
  3. 3.59² =
  4. 4.42² =
  5. 5.71² =
  6. 6.48² =
  7. 7.86² =
  8. 8.45² =
  9. 9.43² =
  10. 10.34² =
  11. 11.67² =
  12. 12.61² =
  13. 13.99² =
  14. 14.95² =
  15. 15.76² =
  16. 16.89² =
  17. 17.57² =
  18. 18.91² =
  19. 19.69² =
  20. 20.98² =
  21. 21.37² =
  22. 22.41² =
  23. 23.33² =
  24. 24.81² =
  25. 25.46² =
  26. 26.62² =
  27. 27.51² =
  28. 28.53² =
  29. 29.75² =
  30. 30.93² =
  31. 31.56² =
  32. 32.72² =
  33. 33.39² =
  34. 34.65² =
  35. 35.82² =
  36. 36.58² =
  37. 37.83² =
  38. 38.66² =
  39. 39.63² =
  40. 40.36² =

Answer key

  1. 1444
  2. 2209
  3. 3481
  4. 1764
  5. 5041
  6. 2304
  7. 7396
  8. 2025
  9. 1849
  10. 1156
  11. 4489
  12. 3721
  13. 9801
  14. 9025
  15. 5776
  16. 7921
  17. 3249
  18. 8281
  19. 4761
  20. 9604
  21. 1369
  22. 1681
  23. 1089
  24. 6561
  25. 2116
  26. 3844
  27. 2601
  28. 2809
  29. 5625
  30. 8649
  31. 3136
  32. 5184
  33. 1521
  34. 4225
  35. 6724
  36. 3364
  37. 6889
  38. 4356
  39. 3969
  40. 1296

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