WALT: solve subtraction problems using various strategies
Problems
|
strategy
|
Answer
|
294-167=
|
294-167=
I can not subtract 7 ones from 4 ones because 7 is greater than 4, so I will borrow one ten from 9 tens and add it to 4 ones and I will have 14 ones, so 14-7=7
Since I borrowed one ten from 9 tens, I am left with 8 tens, so
80-60=20
200-100=100
So 100+20+7= 127
|
=127
|
2) 384-158=
|
384-158=
I can not subtract 8 ones from 4 ones because 8 is greater than 4, so I borrow a 10 from the 8 and its goes down to a 7 so I add the 10 to the 4 ones and the number is 14 so I have enough to take away the 8 ones so 14-8=6
Now that I have borrowed the 10 from the 80, I am now left with 7 tens so 70-50=20
300-100=200
200+20+6=
|
=226
|
After doing two subtraction problems, I feel confident solving subtraction problems using place value partitioning
This comment has been removed by the author.
ReplyDelete