← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 110 · 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. 2.29² =
  3. 3.49² =
  4. 4.61² =
  5. 5.69² =
  6. 6.59² =
  7. 7.71² =
  8. 8.59² =
  9. 9.61² =
  10. 10.21² =
  11. 11.51² =
  12. 12.39² =
  13. 13.89² =
  14. 14.81² =
  15. 15.71² =
  16. 16.89² =
  17. 17.61² =
  18. 18.41² =
  19. 19.79² =
  20. 20.39² =
  21. 21.81² =
  22. 22.51² =
  23. 23.79² =
  24. 24.69² =
  25. 25.29² =
  26. 26.29² =
  27. 27.79² =
  28. 28.21² =
  29. 29.49² =
  30. 30.21² =
  31. 31.39² =
  32. 32.29² =
  33. 33.41² =
  34. 34.41² =
  35. 35.59² =
  36. 36.71² =
  37. 37.79² =
  38. 38.41² =
  39. 39.21² =
  40. 40.59² =

Answer key

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

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