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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 220 · 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. 1.48² =
  2. 2.76² =
  3. 3.39² =
  4. 4.32² =
  5. 5.47² =
  6. 6.57² =
  7. 7.37² =
  8. 8.94² =
  9. 9.91² =
  10. 10.61² =
  11. 11.71² =
  12. 12.41² =
  13. 13.92² =
  14. 14.59² =
  15. 15.96² =
  16. 16.75² =
  17. 17.51² =
  18. 18.58² =
  19. 19.99² =
  20. 20.64² =
  21. 21.85² =
  22. 22.45² =
  23. 23.42² =
  24. 24.88² =
  25. 25.73² =
  26. 26.43² =
  27. 27.74² =
  28. 28.35² =
  29. 29.69² =
  30. 30.38² =
  31. 31.33² =
  32. 32.81² =
  33. 33.82² =
  34. 34.63² =
  35. 35.67² =
  36. 36.79² =
  37. 37.56² =
  38. 38.98² =
  39. 39.66² =
  40. 40.84² =

Answer key

  1. 2304
  2. 5776
  3. 1521
  4. 1024
  5. 2209
  6. 3249
  7. 1369
  8. 8836
  9. 8281
  10. 3721
  11. 5041
  12. 1681
  13. 8464
  14. 3481
  15. 9216
  16. 5625
  17. 2601
  18. 3364
  19. 9801
  20. 4096
  21. 7225
  22. 2025
  23. 1764
  24. 7744
  25. 5329
  26. 1849
  27. 5476
  28. 1225
  29. 4761
  30. 1444
  31. 1089
  32. 6561
  33. 6724
  34. 3969
  35. 4489
  36. 6241
  37. 3136
  38. 9604
  39. 4356
  40. 7056

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