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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 624 · 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. 2.71² =
  3. 3.61² =
  4. 4.79² =
  5. 5.39² =
  6. 6.51² =
  7. 7.19² =
  8. 8.21² =
  9. 9.61² =
  10. 10.71² =
  11. 11.41² =
  12. 12.19² =
  13. 13.41² =
  14. 14.29² =
  15. 15.31² =
  16. 16.71² =
  17. 17.39² =
  18. 18.21² =
  19. 19.61² =
  20. 20.51² =
  21. 21.39² =
  22. 22.29² =
  23. 23.81² =
  24. 24.81² =
  25. 25.19² =
  26. 26.21² =
  27. 27.69² =
  28. 28.81² =
  29. 29.81² =
  30. 30.31² =
  31. 31.69² =
  32. 32.21² =
  33. 33.79² =
  34. 34.21² =
  35. 35.51² =
  36. 36.89² =
  37. 37.59² =
  38. 38.21² =
  39. 39.79² =
  40. 40.79² =

Answer key

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

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