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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 739 · 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. 1.51² =
  2. 2.86² =
  3. 3.49² =
  4. 4.63² =
  5. 5.38² =
  6. 6.71² =
  7. 7.78² =
  8. 8.95² =
  9. 9.88² =
  10. 10.99² =
  11. 11.61² =
  12. 12.91² =
  13. 13.36² =
  14. 14.59² =
  15. 15.41² =
  16. 16.37² =
  17. 17.67² =
  18. 18.69² =
  19. 19.48² =
  20. 20.94² =
  21. 21.47² =
  22. 22.72² =
  23. 23.39² =
  24. 24.44² =
  25. 25.81² =
  26. 26.79² =
  27. 27.33² =
  28. 28.34² =
  29. 29.32² =
  30. 30.75² =
  31. 31.53² =
  32. 32.76² =
  33. 33.97² =
  34. 34.96² =
  35. 35.66² =
  36. 36.45² =
  37. 37.56² =
  38. 38.82² =
  39. 39.31² =
  40. 40.62² =

Answer key

  1. 2601
  2. 7396
  3. 2401
  4. 3969
  5. 1444
  6. 5041
  7. 6084
  8. 9025
  9. 7744
  10. 9801
  11. 3721
  12. 8281
  13. 1296
  14. 3481
  15. 1681
  16. 1369
  17. 4489
  18. 4761
  19. 2304
  20. 8836
  21. 2209
  22. 5184
  23. 1521
  24. 1936
  25. 6561
  26. 6241
  27. 1089
  28. 1156
  29. 1024
  30. 5625
  31. 2809
  32. 5776
  33. 9409
  34. 9216
  35. 4356
  36. 2025
  37. 3136
  38. 6724
  39. 961
  40. 3844

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