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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 81 · 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. 1.92² =
  2. 2.58² =
  3. 3.45² =
  4. 4.99² =
  5. 5.93² =
  6. 6.46² =
  7. 7.54² =
  8. 8.61² =
  9. 9.68² =
  10. 10.73² =
  11. 11.79² =
  12. 12.66² =
  13. 13.47² =
  14. 14.75² =
  15. 15.63² =
  16. 16.39² =
  17. 17.56² =
  18. 18.48² =
  19. 19.33² =
  20. 20.82² =
  21. 21.44² =
  22. 22.69² =
  23. 23.71² =
  24. 24.38² =
  25. 25.31² =
  26. 26.51² =
  27. 27.43² =
  28. 28.91² =
  29. 29.88² =
  30. 30.67² =
  31. 31.37² =
  32. 32.72² =
  33. 33.36² =
  34. 34.86² =
  35. 35.55² =
  36. 36.97² =
  37. 37.57² =
  38. 38.35² =
  39. 39.52² =
  40. 40.85² =

Answer key

  1. 8464
  2. 3364
  3. 2025
  4. 9801
  5. 8649
  6. 2116
  7. 2916
  8. 3721
  9. 4624
  10. 5329
  11. 6241
  12. 4356
  13. 2209
  14. 5625
  15. 3969
  16. 1521
  17. 3136
  18. 2304
  19. 1089
  20. 6724
  21. 1936
  22. 4761
  23. 5041
  24. 1444
  25. 961
  26. 2601
  27. 1849
  28. 8281
  29. 7744
  30. 4489
  31. 1369
  32. 5184
  33. 1296
  34. 7396
  35. 3025
  36. 9409
  37. 3249
  38. 1225
  39. 2704
  40. 7225

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