Make a ten strategy Subtraction Facts: 9 and missing addend described with symbols
Learn subtraction facts with the make-a-ten strategy: subtracting 9, part 3. Free practice at http://[a]www.ilearn.com%2Ffacts[/a]
iLearn provides the easiest and quickest way to learn the make-a-ten strategy that works for all addition and subtraction facts with sums or minuends greater than 10. Without this strategy, these are the hardest facts to learn. With this strategy, they become very easy. Because the strategy is based on the fundamental principle of place value, students have far less difficulty understanding place value later when they learn to add and subtract numbers with 2 or more digits.
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If you prefer to read, rather than watch this video, here’s the transcript:
Title: Make a ten strategy Subtraction Facts: 9 and missing addend described with symbols
In this lesson, we'll answer questions like this. 9 plus what number equals 13?
To find the number we need, we start with the number we know, so we start with 9.
We need one more here to make 10 so we click here to add it.
Now we have 10 and we need 13 in all.
13 is 3 more than 10 so we add 3 more here.
1 and 3 is 4 so we added 4 more in all.
10 and 3 makes 13 so 9 and 4 also makes 13.
13 is 4 more than 9 so we put 4 in the answer box.
9 plus what number equals 17?
To find the number we need, we start with the number we know, so we start with 9.
We need one more here to make 10 so we click here to add it.
Now we have 10 and we need 17 in all.
17 is 7 more than 10 so we add 7 more here.
1 and 7 is 8 so we added 8 more in all.
10 and 7 makes 17 so 9 and 8 also makes 17.
8 is the number we add to 9 to get 17 sSo we put 6 in the answer box.
Now you do some on your own.
Click on a number strip here to put more blocks here.
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