← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 137 · 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. 2.19² =
  3. 3.31² =
  4. 4.39² =
  5. 5.39² =
  6. 6.29² =
  7. 7.29² =
  8. 8.39² =
  9. 9.59² =
  10. 10.89² =
  11. 11.71² =
  12. 12.31² =
  13. 13.31² =
  14. 14.61² =
  15. 15.61² =
  16. 16.29² =
  17. 17.69² =
  18. 18.71² =
  19. 19.69² =
  20. 20.51² =
  21. 21.19² =
  22. 22.59² =
  23. 23.19² =
  24. 24.81² =
  25. 25.39² =
  26. 26.89² =
  27. 27.91² =
  28. 28.79² =
  29. 29.29² =
  30. 30.19² =
  31. 31.29² =
  32. 32.61² =
  33. 33.29² =
  34. 34.61² =
  35. 35.21² =
  36. 36.21² =
  37. 37.59² =
  38. 38.69² =
  39. 39.71² =
  40. 40.81² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths