How do you add 6+7 by using base 10 blocks?

You can add 6 + 7 using base 10 blocks this way: Imagine that you have 2 boxes, 1 with 6 balls and 1 with 7 balls. You need to put 3 bolls in the 2nd box to make 10 on that box. So, you take 3 from the 1st box and put them on the 2nd box. (6) + (7) = (3 + 3) + 7 = (3) + (3 + 7) = (3) + (10) = (13)

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Course: 2nd grade > Unit 1

Lesson 1: Add within 20

Add and subtract within 20: FAQ

Google Classroom

Frequently asked questions about adding and subtracting within 20.

How can we use place value blocks to help add and subtract?

We can use place value blocks to represent each number we want to add, and then combine them to find the total.

For example, if we want to add

12 + 6

, we can start by drawing

12

blocks and then make a second group of place value blocks that has

6

blocks. After we put them together, we will see there are

18

blocks.

For subtraction, we can use the blocks to represent the larger number, and then take away the appropriate number of blocks to find the difference.

For example, to subtract

14 - 8

, we can draw a set of blocks that has

14

place value blocks. Then we can take away

8

place value blocks from the

14

blocks. Now, there are

6

blocks lets.

How can we use ten frames to help add and subtract?

Ten frames can be helpful for adding and subtracting because they allow us to visually see the numbers we're working with. To add using ten frames, we can fill in the frames with the numbers we want to add.

For example, if we want to add

8

and

4

, we could fill in eight squares on one ten frame and four squares on another ten frame. By combining the two frames, we can see that the sum is

12

To subtract using ten frames, we can fill in the frame with the larger number and then remove squares to represent the smaller number. For example, if we want to subtract

3

from

7

, we would fill in seven squares on the ten frame and then remove three squares. This would leave us with four squares filled in, which represents the difference.

How can we use number lines to help add and subtract?

We can use the number line to visually represent the two numbers being added or subtracted. For example, to solve

7 + 9

, we can mark both

7

and

9

on the number line. Then we can see that adding the two numbers together will result in a sum

16

To solve

12 - 4

, mark

12

on the number line. Then we can subtract

4

to see that the jump ends at

8

How can we use arrays to help us add?

We can use arrays to represent repeated addition! For example, an array of

5

rows and

3

columns can be thought of as adding

5 threes

\overset{1}{3} + \overset{2}{3} + \overset{3}{3} + \overset{4}{3} + \overset{5}{3} = 15

Where do we use addition and subtraction in the real world?

We use addition and subtraction all the time! For example, we might use them when we're counting money, dividing up snacks, or measuring ingredients for a recipe.

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2045687
Posted a year ago. Direct link to 2045687's post “How do you add 6+7 by usi...”
How do you add 6+7 by using base 10 blocks?
Comment on 2045687's post “How do you add 6+7 by usi...”
(21 votes)
- Leo Maykell
  Posted a year ago. Direct link to Leo Maykell's post “You can add 6 + 7 using b...”
  You can add 6 + 7 using base 10 blocks this way:
  
  Imagine that you have 2 boxes, 1 with 6 balls and 1 with 7 balls. You need to put 3 bolls in the 2nd box to make 10 on that box. So, you take 3 from the 1st box and put them on the 2nd box.
  
  (6) + (7) =
  (3 + 3) + 7 =
  (3) + (3 + 7) =
  (3) + (10) =
  (13)
  Comment on Leo Maykell's post “You can add 6 + 7 using b...”
  (34 votes)
Melqui
Posted 6 days ago. Direct link to Melqui's post “How does 3+3+3+3+3 equal ...”
How does 3+3+3+3+3 equal 15 and not 16? makes no sense. Someone correct me if im wrong.
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(2 votes)
Answer
- Ellie
  Posted 6 days ago. Direct link to Ellie's post “Hi Melqui! You were reall...”
  Hi Melqui! You were really close. 3+3+3+3+3=15. This is because 3+3=6. Then 6+3=9. And 9+3=12. Finally 12+3=15. You could also say this is 5×3 or 3×5. 5×3 is 5 groups of 3. Hope this helps. Have an amazing day! 😃
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  (1 vote)