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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 371 · 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. 2.71² =
  3. 3.69² =
  4. 4.49² =
  5. 5.21² =
  6. 6.89² =
  7. 7.89² =
  8. 8.69² =
  9. 9.39² =
  10. 10.21² =
  11. 11.31² =
  12. 12.39² =
  13. 13.79² =
  14. 14.59² =
  15. 15.51² =
  16. 16.29² =
  17. 17.49² =
  18. 18.19² =
  19. 19.59² =
  20. 20.89² =
  21. 21.61² =
  22. 22.19² =
  23. 23.49² =
  24. 24.71² =
  25. 25.69² =
  26. 26.19² =
  27. 27.59² =
  28. 28.39² =
  29. 29.71² =
  30. 30.31² =
  31. 31.21² =
  32. 32.51² =
  33. 33.19² =
  34. 34.91² =
  35. 35.91² =
  36. 36.29² =
  37. 37.79² =
  38. 38.81² =
  39. 39.31² =
  40. 40.81² =

Answer key

  1. 441
  2. 5041
  3. 4761
  4. 2401
  5. 441
  6. 7921
  7. 7921
  8. 4761
  9. 1521
  10. 441
  11. 961
  12. 1521
  13. 6241
  14. 3481
  15. 2601
  16. 841
  17. 2401
  18. 361
  19. 3481
  20. 7921
  21. 3721
  22. 361
  23. 2401
  24. 5041
  25. 4761
  26. 361
  27. 3481
  28. 1521
  29. 5041
  30. 961
  31. 441
  32. 2601
  33. 361
  34. 8281
  35. 8281
  36. 841
  37. 6241
  38. 6561
  39. 961
  40. 6561

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