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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 282 · 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. 1.59² =
  2. 2.81² =
  3. 3.89² =
  4. 4.41² =
  5. 5.19² =
  6. 6.41² =
  7. 7.91² =
  8. 8.71² =
  9. 9.71² =
  10. 10.29² =
  11. 11.29² =
  12. 12.79² =
  13. 13.29² =
  14. 14.69² =
  15. 15.59² =
  16. 16.19² =
  17. 17.79² =
  18. 18.91² =
  19. 19.79² =
  20. 20.41² =
  21. 21.29² =
  22. 22.39² =
  23. 23.71² =
  24. 24.39² =
  25. 25.91² =
  26. 26.21² =
  27. 27.19² =
  28. 28.49² =
  29. 29.49² =
  30. 30.69² =
  31. 31.89² =
  32. 32.39² =
  33. 33.49² =
  34. 34.39² =
  35. 35.81² =
  36. 36.69² =
  37. 37.69² =
  38. 38.39² =
  39. 39.49² =
  40. 40.61² =

Answer key

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

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