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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 452 · 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. 1.51² =
  2. 2.69² =
  3. 3.79² =
  4. 4.41² =
  5. 5.41² =
  6. 6.59² =
  7. 7.71² =
  8. 8.21² =
  9. 9.29² =
  10. 10.31² =
  11. 11.51² =
  12. 12.89² =
  13. 13.69² =
  14. 14.29² =
  15. 15.61² =
  16. 16.29² =
  17. 17.39² =
  18. 18.79² =
  19. 19.89² =
  20. 20.49² =
  21. 21.49² =
  22. 22.81² =
  23. 23.51² =
  24. 24.71² =
  25. 25.61² =
  26. 26.21² =
  27. 27.69² =
  28. 28.31² =
  29. 29.19² =
  30. 30.71² =
  31. 31.21² =
  32. 32.61² =
  33. 33.19² =
  34. 34.91² =
  35. 35.61² =
  36. 36.21² =
  37. 37.21² =
  38. 38.39² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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