show how you can make a ten to find the sum 9+7=
9 + 1 + 7 - 1
To find the sum of 9 + 7 using a ten, we can use a technique called regrouping or carrying. Here's how you can do it step-by-step:
Step 1: Write down the numbers 9 and 7 vertically with the ones digit aligned below each other:
9
+ 7
Step 2: Start by adding the ones digits together. In this case, it's 9 + 7 = 16. Since 16 is greater than 10, we need to regroup or carry the value over to the tens digit.
16
9
+ 7
Step 3: Write down the tens digit (1) on top of the tens column.
1
16
9
+ 7
Step 4: Add the tens digits together along with the carried value. In this case, it's 1 + 9 + 7 = 17.
1
16
9
+ 7
------
17
Step 5: Finally, write down the sum under the line, which is 17.
Therefore, 9 + 7 = 16 when using regrouping or carrying to make a ten.
To find the sum of 9 and 7, we can use a number line approach.
1. Start at the number 9 on the number line.
2. Move forward 7 spaces to the right (since we are adding 7).
3. The number you reach is the sum of 9 and 7, which is 16.
Alternatively, you can use a mental math strategy called making a ten.
1. Start with the number 9.
2. Since we need to add 7, one way to make a ten is to add 1 to 9, which equals 10.
3. Now we have 10, and we still need to add 6 more (since 7 - 1 = 6).
4. We can add 6 to 10, which gives us 16.
5. So, the sum of 9 and 7 is 16.