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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 628 · 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. 1.69² =
  2. 2.49² =
  3. 3.79² =
  4. 4.39² =
  5. 5.31² =
  6. 6.49² =
  7. 7.89² =
  8. 8.31² =
  9. 9.29² =
  10. 10.69² =
  11. 11.61² =
  12. 12.29² =
  13. 13.21² =
  14. 14.49² =
  15. 15.69² =
  16. 16.49² =
  17. 17.81² =
  18. 18.29² =
  19. 19.31² =
  20. 20.41² =
  21. 21.29² =
  22. 22.89² =
  23. 23.91² =
  24. 24.21² =
  25. 25.61² =
  26. 26.89² =
  27. 27.79² =
  28. 28.29² =
  29. 29.81² =
  30. 30.39² =
  31. 31.59² =
  32. 32.71² =
  33. 33.59² =
  34. 34.49² =
  35. 35.71² =
  36. 36.61² =
  37. 37.81² =
  38. 38.31² =
  39. 39.49² =
  40. 40.59² =

Answer key

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

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