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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 908 · 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. 1.85² =
  2. 2.58² =
  3. 3.95² =
  4. 4.62² =
  5. 5.47² =
  6. 6.42² =
  7. 7.84² =
  8. 8.68² =
  9. 9.61² =
  10. 10.63² =
  11. 11.97² =
  12. 12.79² =
  13. 13.78² =
  14. 14.41² =
  15. 15.52² =
  16. 16.82² =
  17. 17.31² =
  18. 18.37² =
  19. 19.71² =
  20. 20.45² =
  21. 21.86² =
  22. 22.98² =
  23. 23.53² =
  24. 24.72² =
  25. 25.33² =
  26. 26.44² =
  27. 27.66² =
  28. 28.89² =
  29. 29.57² =
  30. 30.75² =
  31. 31.54² =
  32. 32.48² =
  33. 33.46² =
  34. 34.36² =
  35. 35.35² =
  36. 36.34² =
  37. 37.87² =
  38. 38.56² =
  39. 39.55² =
  40. 40.67² =

Answer key

  1. 7225
  2. 3364
  3. 9025
  4. 3844
  5. 2209
  6. 1764
  7. 7056
  8. 4624
  9. 3721
  10. 3969
  11. 9409
  12. 6241
  13. 6084
  14. 1681
  15. 2704
  16. 6724
  17. 961
  18. 1369
  19. 5041
  20. 2025
  21. 7396
  22. 9604
  23. 2809
  24. 5184
  25. 1089
  26. 1936
  27. 4356
  28. 7921
  29. 3249
  30. 5625
  31. 2916
  32. 2304
  33. 2116
  34. 1296
  35. 1225
  36. 1156
  37. 7569
  38. 3136
  39. 3025
  40. 4489

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