Step-by-step Maths Level 2: Taking away with bonds to 10
Part of the Step-by-step Maths Level 2 taking away within 20 chapter. Chapter overview · whole chapter on one page
Taking away with bonds to 10
Sometimes you have to take away more than the ones. For 15 - 8, first take away 5 to reach 10.
Then take the rest away from 10: 10 - 3 = 7.
Key ideas
- Take away the part that gets to 10 first.
- Then take the rest away from 10.
- Check by adding back.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 5 away from 15. That leaves exactly 10.15 - 5 = 10
- Take the rest, 3, away from 10. 8 is 5 and 3, so take away 3 now.10 - 3 = 7
- Write the answer. 7
Check. Add back: 7 + 8 = 15. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 3 away from 13. That leaves exactly 10.13 - 3 = 10
- Take the rest, 3, away from 10. 6 is 3 and 3, so take away 3 now.10 - 3 = 7
- Write the answer. 7
Check. Add back: 7 + 6 = 13. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 7 away from 17. That leaves exactly 10.17 - 7 = 10
- Take the rest, 2, away from 10. 9 is 7 and 2, so take away 2 now.10 - 2 = 8
- Write the answer. 8
Check. Add back: 8 + 9 = 17. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Watch out
Watch out. Do not take all of the number from 10. Go to 10 first, then take the rest.
Exam tip
Grown-up tip. Use two colours of counters. Take away the first colour to reach 10, then the second colour.
Exercise 6C Practice: taking away through 10
Non-calculatorMethod. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 1 away from 11. That leaves exactly 10.11 - 1 = 10
- Take the rest, 6, away from 10. 7 is 1 and 6, so take away 6 now.10 - 6 = 4
- Write the answer. 4
Check. Add back: 4 + 7 = 11. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 1 away from 11. That leaves exactly 10.11 - 1 = 10
- Take the rest, 3, away from 10. 4 is 1 and 3, so take away 3 now.10 - 3 = 7
- Write the answer. 7
Check. Add back: 7 + 4 = 11. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 2 away from 12. That leaves exactly 10.12 - 2 = 10
- Take the rest, 5, away from 10. 7 is 2 and 5, so take away 5 now.10 - 5 = 5
- Write the answer. 5
Check. Add back: 5 + 7 = 12. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 2 away from 12. That leaves exactly 10.12 - 2 = 10
- Take the rest, 6, away from 10. 8 is 2 and 6, so take away 6 now.10 - 6 = 4
- Write the answer. 4
Check. Add back: 4 + 8 = 12. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 4 away from 14. That leaves exactly 10.14 - 4 = 10
- Take the rest, 2, away from 10. 6 is 4 and 2, so take away 2 now.10 - 2 = 8
- Write the answer. 8
Check. Add back: 8 + 6 = 14. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 4 away from 14. That leaves exactly 10.14 - 4 = 10
- Take the rest, 5, away from 10. 9 is 4 and 5, so take away 5 now.10 - 5 = 5
- Write the answer. 5
Check. Add back: 5 + 9 = 14. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 7 away from 17. That leaves exactly 10.17 - 7 = 10
- Take the rest, 1, away from 10. 8 is 7 and 1, so take away 1 now.10 - 1 = 9
- Write the answer. 9
Check. Add back: 9 + 8 = 17. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 1 away from 11. That leaves exactly 10.11 - 1 = 10
- Take the rest, 1, away from 10. 2 is 1 and 1, so take away 1 now.10 - 1 = 9
- Write the answer. 9
Check. Add back: 9 + 2 = 11. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 1 away from 11. That leaves exactly 10.11 - 1 = 10
- Take the rest, 7, away from 10. 8 is 1 and 7, so take away 7 now.10 - 7 = 3
- Write the answer. 3
Check. Add back: 3 + 8 = 11. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 3 away from 13. That leaves exactly 10.13 - 3 = 10
- Take the rest, 5, away from 10. 8 is 3 and 5, so take away 5 now.10 - 5 = 5
- Write the answer. 5
Check. Add back: 5 + 8 = 13. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 4 away from 14. That leaves exactly 10.14 - 4 = 10
- Take the rest, 3, away from 10. 7 is 4 and 3, so take away 3 now.10 - 3 = 7
- Write the answer. 7
Check. Add back: 7 + 7 = 14. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 5 away from 15. That leaves exactly 10.15 - 5 = 10
- Take the rest, 3, away from 10. 8 is 5 and 3, so take away 3 now.10 - 3 = 7
- Write the answer. 7
Check. Add back: 7 + 8 = 15. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 4 away from 14. That leaves exactly 10.14 - 4 = 10
- Take the rest, 1, away from 10. 5 is 4 and 1, so take away 1 now.10 - 1 = 9
- Write the answer. 9
Check. Add back: 9 + 5 = 14. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 4 away from 14. That leaves exactly 10.14 - 4 = 10
- Take the rest, 4, away from 10. 8 is 4 and 4, so take away 4 now.10 - 4 = 6
- Write the answer. 6
Check. Add back: 6 + 8 = 14. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 3 away from 13. That leaves exactly 10.13 - 3 = 10
- Take the rest, 4, away from 10. 7 is 3 and 4, so take away 4 now.10 - 4 = 6
- Write the answer. 6
Check. Add back: 6 + 7 = 13. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.
Method. Use a bond to 10 to help. Take away the part that gets to 10 first.
- Take 6 away from 16. That leaves exactly 10.16 - 6 = 10
- Take the rest, 2, away from 10. 8 is 6 and 2, so take away 2 now.10 - 2 = 8
- Write the answer. 8
Check. Add back: 8 + 8 = 16. It is right.
Watch out. Going through 10 can be done in two steps. Do not take the whole number from 10 by mistake.