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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 703 · 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. 1.41² =
  2. 2.81² =
  3. 3.39² =
  4. 4.19² =
  5. 5.71² =
  6. 6.89² =
  7. 7.29² =
  8. 8.61² =
  9. 9.41² =
  10. 10.29² =
  11. 11.69² =
  12. 12.59² =
  13. 13.91² =
  14. 14.39² =
  15. 15.41² =
  16. 16.21² =
  17. 17.71² =
  18. 18.79² =
  19. 19.89² =
  20. 20.39² =
  21. 21.19² =
  22. 22.19² =
  23. 23.79² =
  24. 24.79² =
  25. 25.71² =
  26. 26.69² =
  27. 27.21² =
  28. 28.89² =
  29. 29.89² =
  30. 30.79² =
  31. 31.89² =
  32. 32.91² =
  33. 33.71² =
  34. 34.81² =
  35. 35.71² =
  36. 36.21² =
  37. 37.59² =
  38. 38.19² =
  39. 39.61² =
  40. 40.91² =

Answer key

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

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