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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 141 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.39² =
  3. 3.21² =
  4. 4.49² =
  5. 5.19² =
  6. 6.51² =
  7. 7.49² =
  8. 8.69² =
  9. 9.71² =
  10. 10.19² =
  11. 11.51² =
  12. 12.49² =
  13. 13.81² =
  14. 14.51² =
  15. 15.31² =
  16. 16.61² =
  17. 17.41² =
  18. 18.49² =
  19. 19.91² =
  20. 20.79² =
  21. 21.51² =
  22. 22.41² =
  23. 23.21² =
  24. 24.71² =
  25. 25.91² =
  26. 26.41² =
  27. 27.61² =
  28. 28.89² =
  29. 29.71² =
  30. 30.89² =
  31. 31.21² =
  32. 32.39² =
  33. 33.31² =
  34. 34.61² =
  35. 35.49² =
  36. 36.31² =
  37. 37.19² =
  38. 38.79² =
  39. 39.21² =
  40. 40.71² =

Answer key

  1. 2401
  2. 1521
  3. 441
  4. 2401
  5. 361
  6. 2601
  7. 2401
  8. 4761
  9. 5041
  10. 361
  11. 2601
  12. 2401
  13. 6561
  14. 2601
  15. 961
  16. 3721
  17. 1681
  18. 2401
  19. 8281
  20. 6241
  21. 2601
  22. 1681
  23. 441
  24. 5041
  25. 8281
  26. 1681
  27. 3721
  28. 7921
  29. 5041
  30. 7921
  31. 441
  32. 1521
  33. 961
  34. 3721
  35. 2401
  36. 961
  37. 361
  38. 6241
  39. 441
  40. 5041

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