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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 411 · 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. 1.79² =
  2. 2.59² =
  3. 3.21² =
  4. 4.41² =
  5. 5.89² =
  6. 6.79² =
  7. 7.21² =
  8. 8.69² =
  9. 9.31² =
  10. 10.39² =
  11. 11.21² =
  12. 12.19² =
  13. 13.69² =
  14. 14.61² =
  15. 15.29² =
  16. 16.91² =
  17. 17.81² =
  18. 18.29² =
  19. 19.49² =
  20. 20.51² =
  21. 21.21² =
  22. 22.29² =
  23. 23.61² =
  24. 24.49² =
  25. 25.61² =
  26. 26.61² =
  27. 27.69² =
  28. 28.89² =
  29. 29.59² =
  30. 30.29² =
  31. 31.81² =
  32. 32.89² =
  33. 33.19² =
  34. 34.59² =
  35. 35.31² =
  36. 36.29² =
  37. 37.39² =
  38. 38.79² =
  39. 39.71² =
  40. 40.29² =

Answer key

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

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