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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 367 · 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. 1.19² =
  2. 2.89² =
  3. 3.51² =
  4. 4.71² =
  5. 5.31² =
  6. 6.59² =
  7. 7.79² =
  8. 8.39² =
  9. 9.81² =
  10. 10.19² =
  11. 11.21² =
  12. 12.29² =
  13. 13.21² =
  14. 14.21² =
  15. 15.49² =
  16. 16.21² =
  17. 17.81² =
  18. 18.69² =
  19. 19.41² =
  20. 20.19² =
  21. 21.49² =
  22. 22.41² =
  23. 23.19² =
  24. 24.41² =
  25. 25.61² =
  26. 26.29² =
  27. 27.31² =
  28. 28.61² =
  29. 29.31² =
  30. 30.89² =
  31. 31.61² =
  32. 32.69² =
  33. 33.51² =
  34. 34.69² =
  35. 35.19² =
  36. 36.59² =
  37. 37.91² =
  38. 38.19² =
  39. 39.71² =
  40. 40.59² =

Answer key

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

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