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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 23 · 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. 1.21² =
  2. 2.79² =
  3. 3.89² =
  4. 4.69² =
  5. 5.59² =
  6. 6.71² =
  7. 7.31² =
  8. 8.89² =
  9. 9.79² =
  10. 10.49² =
  11. 11.91² =
  12. 12.89² =
  13. 13.51² =
  14. 14.39² =
  15. 15.39² =
  16. 16.49² =
  17. 17.49² =
  18. 18.19² =
  19. 19.69² =
  20. 20.41² =
  21. 21.79² =
  22. 22.71² =
  23. 23.61² =
  24. 24.41² =
  25. 25.29² =
  26. 26.89² =
  27. 27.29² =
  28. 28.29² =
  29. 29.41² =
  30. 30.51² =
  31. 31.69² =
  32. 32.19² =
  33. 33.19² =
  34. 34.71² =
  35. 35.59² =
  36. 36.39² =
  37. 37.29² =
  38. 38.79² =
  39. 39.31² =
  40. 40.31² =

Answer key

  1. 441
  2. 6241
  3. 7921
  4. 4761
  5. 3481
  6. 5041
  7. 961
  8. 7921
  9. 6241
  10. 2401
  11. 8281
  12. 7921
  13. 2601
  14. 1521
  15. 1521
  16. 2401
  17. 2401
  18. 361
  19. 4761
  20. 1681
  21. 6241
  22. 5041
  23. 3721
  24. 1681
  25. 841
  26. 7921
  27. 841
  28. 841
  29. 1681
  30. 2601
  31. 4761
  32. 361
  33. 361
  34. 5041
  35. 3481
  36. 1521
  37. 841
  38. 6241
  39. 961
  40. 961

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