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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 400 · 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. 1.59² =
  2. 2.65² =
  3. 3.45² =
  4. 4.33² =
  5. 5.91² =
  6. 6.43² =
  7. 7.62² =
  8. 8.41² =
  9. 9.78² =
  10. 10.64² =
  11. 11.73² =
  12. 12.48² =
  13. 13.92² =
  14. 14.84² =
  15. 15.66² =
  16. 16.86² =
  17. 17.51² =
  18. 18.67² =
  19. 19.58² =
  20. 20.98² =
  21. 21.97² =
  22. 22.85² =
  23. 23.47² =
  24. 24.69² =
  25. 25.89² =
  26. 26.34² =
  27. 27.35² =
  28. 28.61² =
  29. 29.75² =
  30. 30.76² =
  31. 31.32² =
  32. 32.71² =
  33. 33.39² =
  34. 34.42² =
  35. 35.88² =
  36. 36.93² =
  37. 37.81² =
  38. 38.68² =
  39. 39.38² =
  40. 40.52² =

Answer key

  1. 3481
  2. 4225
  3. 2025
  4. 1089
  5. 8281
  6. 1849
  7. 3844
  8. 1681
  9. 6084
  10. 4096
  11. 5329
  12. 2304
  13. 8464
  14. 7056
  15. 4356
  16. 7396
  17. 2601
  18. 4489
  19. 3364
  20. 9604
  21. 9409
  22. 7225
  23. 2209
  24. 4761
  25. 7921
  26. 1156
  27. 1225
  28. 3721
  29. 5625
  30. 5776
  31. 1024
  32. 5041
  33. 1521
  34. 1764
  35. 7744
  36. 8649
  37. 6561
  38. 4624
  39. 1444
  40. 2704

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