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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 609 · 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. 1.59² =
  2. 2.29² =
  3. 3.19² =
  4. 4.69² =
  5. 5.49² =
  6. 6.61² =
  7. 7.31² =
  8. 8.41² =
  9. 9.81² =
  10. 10.69² =
  11. 11.29² =
  12. 12.19² =
  13. 13.29² =
  14. 14.69² =
  15. 15.21² =
  16. 16.89² =
  17. 17.81² =
  18. 18.29² =
  19. 19.61² =
  20. 20.69² =
  21. 21.71² =
  22. 22.61² =
  23. 23.59² =
  24. 24.71² =
  25. 25.49² =
  26. 26.59² =
  27. 27.21² =
  28. 28.31² =
  29. 29.29² =
  30. 30.49² =
  31. 31.51² =
  32. 32.79² =
  33. 33.39² =
  34. 34.41² =
  35. 35.49² =
  36. 36.71² =
  37. 37.91² =
  38. 38.89² =
  39. 39.29² =
  40. 40.79² =

Answer key

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

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