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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 582 · 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. 1.49² =
  2. 2.79² =
  3. 3.71² =
  4. 4.79² =
  5. 5.41² =
  6. 6.91² =
  7. 7.69² =
  8. 8.71² =
  9. 9.59² =
  10. 10.39² =
  11. 11.39² =
  12. 12.19² =
  13. 13.41² =
  14. 14.81² =
  15. 15.61² =
  16. 16.19² =
  17. 17.39² =
  18. 18.79² =
  19. 19.81² =
  20. 20.41² =
  21. 21.59² =
  22. 22.89² =
  23. 23.61² =
  24. 24.79² =
  25. 25.81² =
  26. 26.79² =
  27. 27.81² =
  28. 28.61² =
  29. 29.81² =
  30. 30.89² =
  31. 31.79² =
  32. 32.61² =
  33. 33.71² =
  34. 34.71² =
  35. 35.21² =
  36. 36.49² =
  37. 37.71² =
  38. 38.39² =
  39. 39.29² =
  40. 40.81² =

Answer key

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

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