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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 345 · 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. 1.89² =
  2. 2.21² =
  3. 3.81² =
  4. 4.39² =
  5. 5.19² =
  6. 6.89² =
  7. 7.29² =
  8. 8.79² =
  9. 9.69² =
  10. 10.41² =
  11. 11.29² =
  12. 12.69² =
  13. 13.49² =
  14. 14.29² =
  15. 15.29² =
  16. 16.61² =
  17. 17.19² =
  18. 18.31² =
  19. 19.61² =
  20. 20.91² =
  21. 21.79² =
  22. 22.19² =
  23. 23.71² =
  24. 24.29² =
  25. 25.41² =
  26. 26.21² =
  27. 27.49² =
  28. 28.41² =
  29. 29.19² =
  30. 30.29² =
  31. 31.61² =
  32. 32.71² =
  33. 33.29² =
  34. 34.61² =
  35. 35.91² =
  36. 36.21² =
  37. 37.29² =
  38. 38.69² =
  39. 39.39² =
  40. 40.81² =

Answer key

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

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