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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 533 · 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. 2.29² =
  3. 3.89² =
  4. 4.61² =
  5. 5.89² =
  6. 6.31² =
  7. 7.49² =
  8. 8.21² =
  9. 9.51² =
  10. 10.19² =
  11. 11.59² =
  12. 12.29² =
  13. 13.79² =
  14. 14.31² =
  15. 15.21² =
  16. 16.29² =
  17. 17.29² =
  18. 18.69² =
  19. 19.29² =
  20. 20.69² =
  21. 21.81² =
  22. 22.81² =
  23. 23.49² =
  24. 24.91² =
  25. 25.19² =
  26. 26.21² =
  27. 27.89² =
  28. 28.49² =
  29. 29.59² =
  30. 30.81² =
  31. 31.59² =
  32. 32.81² =
  33. 33.59² =
  34. 34.81² =
  35. 35.39² =
  36. 36.61² =
  37. 37.79² =
  38. 38.71² =
  39. 39.59² =
  40. 40.41² =

Answer key

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

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