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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 450 · 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. 1.76² =
  2. 2.91² =
  3. 3.45² =
  4. 4.57² =
  5. 5.54² =
  6. 6.86² =
  7. 7.98² =
  8. 8.99² =
  9. 9.51² =
  10. 10.68² =
  11. 11.84² =
  12. 12.94² =
  13. 13.48² =
  14. 14.52² =
  15. 15.92² =
  16. 16.47² =
  17. 17.61² =
  18. 18.77² =
  19. 19.33² =
  20. 20.43² =
  21. 21.56² =
  22. 22.37² =
  23. 23.35² =
  24. 24.83² =
  25. 25.55² =
  26. 26.81² =
  27. 27.66² =
  28. 28.42² =
  29. 29.67² =
  30. 30.41² =
  31. 31.62² =
  32. 32.71² =
  33. 33.88² =
  34. 34.74² =
  35. 35.36² =
  36. 36.64² =
  37. 37.46² =
  38. 38.85² =
  39. 39.69² =
  40. 40.73² =

Answer key

  1. 5776
  2. 8281
  3. 2025
  4. 3249
  5. 2916
  6. 7396
  7. 9604
  8. 9801
  9. 2601
  10. 4624
  11. 7056
  12. 8836
  13. 2304
  14. 2704
  15. 8464
  16. 2209
  17. 3721
  18. 5929
  19. 1089
  20. 1849
  21. 3136
  22. 1369
  23. 1225
  24. 6889
  25. 3025
  26. 6561
  27. 4356
  28. 1764
  29. 4489
  30. 1681
  31. 3844
  32. 5041
  33. 7744
  34. 5476
  35. 1296
  36. 4096
  37. 2116
  38. 7225
  39. 4761
  40. 5329

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