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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 440 · 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. 1.61² =
  2. 2.49² =
  3. 3.71² =
  4. 4.61² =
  5. 5.41² =
  6. 6.49² =
  7. 7.19² =
  8. 8.31² =
  9. 9.69² =
  10. 10.29² =
  11. 11.69² =
  12. 12.71² =
  13. 13.49² =
  14. 14.21² =
  15. 15.79² =
  16. 16.21² =
  17. 17.71² =
  18. 18.21² =
  19. 19.31² =
  20. 20.81² =
  21. 21.69² =
  22. 22.39² =
  23. 23.49² =
  24. 24.61² =
  25. 25.89² =
  26. 26.59² =
  27. 27.19² =
  28. 28.59² =
  29. 29.51² =
  30. 30.89² =
  31. 31.51² =
  32. 32.69² =
  33. 33.21² =
  34. 34.71² =
  35. 35.21² =
  36. 36.61² =
  37. 37.59² =
  38. 38.91² =
  39. 39.69² =
  40. 40.29² =

Answer key

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

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