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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 980 · 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. 1.83² =
  2. 2.98² =
  3. 3.37² =
  4. 4.51² =
  5. 5.69² =
  6. 6.94² =
  7. 7.88² =
  8. 8.48² =
  9. 9.45² =
  10. 10.32² =
  11. 11.85² =
  12. 12.72² =
  13. 13.64² =
  14. 14.99² =
  15. 15.34² =
  16. 16.57² =
  17. 17.66² =
  18. 18.92² =
  19. 19.61² =
  20. 20.78² =
  21. 21.71² =
  22. 22.65² =
  23. 23.86² =
  24. 24.97² =
  25. 25.31² =
  26. 26.44² =
  27. 27.84² =
  28. 28.62² =
  29. 29.41² =
  30. 30.93² =
  31. 31.47² =
  32. 32.79² =
  33. 33.33² =
  34. 34.35² =
  35. 35.55² =
  36. 36.76² =
  37. 37.46² =
  38. 38.96² =
  39. 39.63² =
  40. 40.82² =

Answer key

  1. 6889
  2. 9604
  3. 1369
  4. 2601
  5. 4761
  6. 8836
  7. 7744
  8. 2304
  9. 2025
  10. 1024
  11. 7225
  12. 5184
  13. 4096
  14. 9801
  15. 1156
  16. 3249
  17. 4356
  18. 8464
  19. 3721
  20. 6084
  21. 5041
  22. 4225
  23. 7396
  24. 9409
  25. 961
  26. 1936
  27. 7056
  28. 3844
  29. 1681
  30. 8649
  31. 2209
  32. 6241
  33. 1089
  34. 1225
  35. 3025
  36. 5776
  37. 2116
  38. 9216
  39. 3969
  40. 6724

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