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G.2 Addition using number lines - sums up to 10

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Understanding Addition

Addition is putting numbers together to find out how many in all. When we add, we combine two groups into one total.

Examples:
  • 3 + 2 = 5 means if you have 3 apples and get 2 more, you have 5 apples in all.
  • 1 + 4 = 5 means one block plus four blocks equals five blocks.
  • 0 + 6 = 6 means adding zero does not change the number.
Helpful Hint

Think of addition as "putting together." The answer is called the sum.

Using Objects to Add

We can use objects, like counters, blocks, or drawings, to show how numbers are added together.

Examples:
  • Put 2 red cubes and 3 blue cubes together. Count them all: 2 + 3 = 5.
  • Draw 4 circles and add 1 more. Count them: 4 + 1 = 5.
Helpful Hint

Use real items, like buttons or toys, to make addition hands-on and easier to see.

Adding on a Number Line

A number line helps us add by starting at one number and moving forward to add the other number.

Examples:
  • Start at 2 on the number line. Move 3 steps forward. You land on 5. So, 2 + 3 = 5.
  • Start at 4. Move 5 steps forward. You land on 9. So, 4 + 5 = 9.
Helpful Hint

Always move to the right when adding on a number line because the total gets bigger.

Making Ten

We can break apart numbers to make a sum of 10. This is a useful strategy for solving addition problems quickly.

Examples:
  • 7 + 3 = 10 is a "make ten" fact.
  • To solve 8 + 2, think "8 needs 2 more to make 10." So, 8 + 2 = 10.
  • To solve 6 + 4, think "6 and 4 go together to make 10."
Helpful Hint

Remember the pairs of numbers that make 10: 1+9, 2+8, 3+7, 4+6, 5+5.

Addition in Real Life

We use addition every day when we count things, put groups together, or figure out totals.

Real-Life Examples:
  • If you have 2 pencils and get 3 more, you now have 2 + 3 = 5 pencils.
  • There are 4 dogs at the park. 2 more dogs come. Now there are 4 + 2 = 6 dogs.
  • You read 5 pages today and 4 pages yesterday. That’s 5 + 4 = 9 pages in all.
Try This

Look around your home or classroom. Add groups of objects, like books, toys, or snacks, and find out how many there are in all.