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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 719 · 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. 1.29² =
  2. 2.21² =
  3. 3.31² =
  4. 4.71² =
  5. 5.59² =
  6. 6.39² =
  7. 7.79² =
  8. 8.61² =
  9. 9.31² =
  10. 10.59² =
  11. 11.29² =
  12. 12.79² =
  13. 13.61² =
  14. 14.71² =
  15. 15.59² =
  16. 16.39² =
  17. 17.51² =
  18. 18.39² =
  19. 19.71² =
  20. 20.51² =
  21. 21.49² =
  22. 22.51² =
  23. 23.71² =
  24. 24.41² =
  25. 25.79² =
  26. 26.19² =
  27. 27.79² =
  28. 28.69² =
  29. 29.71² =
  30. 30.69² =
  31. 31.89² =
  32. 32.89² =
  33. 33.79² =
  34. 34.61² =
  35. 35.21² =
  36. 36.49² =
  37. 37.29² =
  38. 38.31² =
  39. 39.59² =
  40. 40.39² =

Answer key

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

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