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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 50 · 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. 1.21² =
  2. 2.49² =
  3. 3.21² =
  4. 4.39² =
  5. 5.71² =
  6. 6.41² =
  7. 7.91² =
  8. 8.59² =
  9. 9.21² =
  10. 10.81² =
  11. 11.49² =
  12. 12.29² =
  13. 13.59² =
  14. 14.19² =
  15. 15.79² =
  16. 16.31² =
  17. 17.89² =
  18. 18.41² =
  19. 19.91² =
  20. 20.81² =
  21. 21.31² =
  22. 22.59² =
  23. 23.69² =
  24. 24.21² =
  25. 25.81² =
  26. 26.39² =
  27. 27.51² =
  28. 28.51² =
  29. 29.19² =
  30. 30.29² =
  31. 31.39² =
  32. 32.89² =
  33. 33.79² =
  34. 34.91² =
  35. 35.59² =
  36. 36.81² =
  37. 37.79² =
  38. 38.49² =
  39. 39.19² =
  40. 40.39² =

Answer key

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

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