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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 18 · 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. 1.71² =
  2. 2.19² =
  3. 3.51² =
  4. 4.39² =
  5. 5.31² =
  6. 6.41² =
  7. 7.89² =
  8. 8.59² =
  9. 9.69² =
  10. 10.39² =
  11. 11.89² =
  12. 12.79² =
  13. 13.19² =
  14. 14.21² =
  15. 15.39² =
  16. 16.81² =
  17. 17.91² =
  18. 18.89² =
  19. 19.41² =
  20. 20.69² =
  21. 21.69² =
  22. 22.91² =
  23. 23.79² =
  24. 24.79² =
  25. 25.91² =
  26. 26.59² =
  27. 27.21² =
  28. 28.89² =
  29. 29.91² =
  30. 30.61² =
  31. 31.29² =
  32. 32.39² =
  33. 33.59² =
  34. 34.51² =
  35. 35.91² =
  36. 36.31² =
  37. 37.39² =
  38. 38.49² =
  39. 39.79² =
  40. 40.79² =

Answer key

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

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