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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 17 · 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. 1.99² =
  2. 2.61² =
  3. 3.63² =
  4. 4.66² =
  5. 5.35² =
  6. 6.48² =
  7. 7.62² =
  8. 8.81² =
  9. 9.73² =
  10. 10.67² =
  11. 11.46² =
  12. 12.69² =
  13. 13.42² =
  14. 14.33² =
  15. 15.82² =
  16. 16.43² =
  17. 17.88² =
  18. 18.74² =
  19. 19.59² =
  20. 20.49² =
  21. 21.96² =
  22. 22.55² =
  23. 23.37² =
  24. 24.45² =
  25. 25.71² =
  26. 26.84² =
  27. 27.97² =
  28. 28.58² =
  29. 29.41² =
  30. 30.91² =
  31. 31.77² =
  32. 32.79² =
  33. 33.64² =
  34. 34.47² =
  35. 35.87² =
  36. 36.94² =
  37. 37.51² =
  38. 38.32² =
  39. 39.98² =
  40. 40.57² =

Answer key

  1. 9801
  2. 3721
  3. 3969
  4. 4356
  5. 1225
  6. 2304
  7. 3844
  8. 6561
  9. 5329
  10. 4489
  11. 2116
  12. 4761
  13. 1764
  14. 1089
  15. 6724
  16. 1849
  17. 7744
  18. 5476
  19. 3481
  20. 2401
  21. 9216
  22. 3025
  23. 1369
  24. 2025
  25. 5041
  26. 7056
  27. 9409
  28. 3364
  29. 1681
  30. 8281
  31. 5929
  32. 6241
  33. 4096
  34. 2209
  35. 7569
  36. 8836
  37. 2601
  38. 1024
  39. 9604
  40. 3249

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