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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 32 · 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. 2.39² =
  3. 3.59² =
  4. 4.31² =
  5. 5.89² =
  6. 6.29² =
  7. 7.69² =
  8. 8.91² =
  9. 9.31² =
  10. 10.19² =
  11. 11.79² =
  12. 12.19² =
  13. 13.71² =
  14. 14.69² =
  15. 15.39² =
  16. 16.89² =
  17. 17.39² =
  18. 18.39² =
  19. 19.79² =
  20. 20.59² =
  21. 21.21² =
  22. 22.59² =
  23. 23.29² =
  24. 24.21² =
  25. 25.61² =
  26. 26.49² =
  27. 27.31² =
  28. 28.71² =
  29. 29.21² =
  30. 30.41² =
  31. 31.69² =
  32. 32.69² =
  33. 33.39² =
  34. 34.41² =
  35. 35.91² =
  36. 36.61² =
  37. 37.39² =
  38. 38.71² =
  39. 39.61² =
  40. 40.79² =

Answer key

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

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