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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 579 · 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. 1.31² =
  2. 2.19² =
  3. 3.59² =
  4. 4.21² =
  5. 5.49² =
  6. 6.69² =
  7. 7.49² =
  8. 8.49² =
  9. 9.61² =
  10. 10.59² =
  11. 11.89² =
  12. 12.59² =
  13. 13.29² =
  14. 14.89² =
  15. 15.91² =
  16. 16.61² =
  17. 17.39² =
  18. 18.29² =
  19. 19.71² =
  20. 20.21² =
  21. 21.71² =
  22. 22.39² =
  23. 23.39² =
  24. 24.31² =
  25. 25.91² =
  26. 26.41² =
  27. 27.39² =
  28. 28.51² =
  29. 29.79² =
  30. 30.89² =
  31. 31.69² =
  32. 32.49² =
  33. 33.89² =
  34. 34.69² =
  35. 35.89² =
  36. 36.29² =
  37. 37.29² =
  38. 38.79² =
  39. 39.91² =
  40. 40.79² =

Answer key

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

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