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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 823 · 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. 1.39² =
  2. 2.19² =
  3. 3.89² =
  4. 4.71² =
  5. 5.89² =
  6. 6.21² =
  7. 7.29² =
  8. 8.79² =
  9. 9.29² =
  10. 10.51² =
  11. 11.49² =
  12. 12.21² =
  13. 13.49² =
  14. 14.59² =
  15. 15.59² =
  16. 16.31² =
  17. 17.79² =
  18. 18.31² =
  19. 19.61² =
  20. 20.81² =
  21. 21.39² =
  22. 22.79² =
  23. 23.69² =
  24. 24.79² =
  25. 25.41² =
  26. 26.49² =
  27. 27.51² =
  28. 28.39² =
  29. 29.59² =
  30. 30.39² =
  31. 31.71² =
  32. 32.31² =
  33. 33.59² =
  34. 34.21² =
  35. 35.19² =
  36. 36.79² =
  37. 37.71² =
  38. 38.29² =
  39. 39.89² =
  40. 40.61² =

Answer key

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

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