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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 26 · 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. 1.19² =
  2. 2.59² =
  3. 3.21² =
  4. 4.61² =
  5. 5.29² =
  6. 6.29² =
  7. 7.31² =
  8. 8.21² =
  9. 9.69² =
  10. 10.81² =
  11. 11.21² =
  12. 12.79² =
  13. 13.81² =
  14. 14.39² =
  15. 15.89² =
  16. 16.41² =
  17. 17.59² =
  18. 18.71² =
  19. 19.71² =
  20. 20.19² =
  21. 21.79² =
  22. 22.49² =
  23. 23.59² =
  24. 24.39² =
  25. 25.91² =
  26. 26.59² =
  27. 27.39² =
  28. 28.41² =
  29. 29.41² =
  30. 30.71² =
  31. 31.69² =
  32. 32.41² =
  33. 33.29² =
  34. 34.21² =
  35. 35.51² =
  36. 36.49² =
  37. 37.61² =
  38. 38.79² =
  39. 39.59² =
  40. 40.19² =

Answer key

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

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