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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 678 · 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. 1.81² =
  2. 2.79² =
  3. 3.61² =
  4. 4.69² =
  5. 5.49² =
  6. 6.89² =
  7. 7.21² =
  8. 8.41² =
  9. 9.29² =
  10. 10.81² =
  11. 11.19² =
  12. 12.19² =
  13. 13.61² =
  14. 14.21² =
  15. 15.49² =
  16. 16.49² =
  17. 17.21² =
  18. 18.81² =
  19. 19.59² =
  20. 20.91² =
  21. 21.19² =
  22. 22.39² =
  23. 23.71² =
  24. 24.89² =
  25. 25.49² =
  26. 26.29² =
  27. 27.51² =
  28. 28.31² =
  29. 29.79² =
  30. 30.41² =
  31. 31.31² =
  32. 32.39² =
  33. 33.61² =
  34. 34.81² =
  35. 35.49² =
  36. 36.41² =
  37. 37.89² =
  38. 38.91² =
  39. 39.81² =
  40. 40.29² =

Answer key

  1. 6561
  2. 6241
  3. 3721
  4. 4761
  5. 2401
  6. 7921
  7. 441
  8. 1681
  9. 841
  10. 6561
  11. 361
  12. 361
  13. 3721
  14. 441
  15. 2401
  16. 2401
  17. 441
  18. 6561
  19. 3481
  20. 8281
  21. 361
  22. 1521
  23. 5041
  24. 7921
  25. 2401
  26. 841
  27. 2601
  28. 961
  29. 6241
  30. 1681
  31. 961
  32. 1521
  33. 3721
  34. 6561
  35. 2401
  36. 1681
  37. 7921
  38. 8281
  39. 6561
  40. 841

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