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Make a Number Line to Add

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Make a Number Line to Add
CCSS.MATH.CONTENT.2.OA.A.1:

Basics on the topic Make a Number Line to Add

Content

What do you learn about making a number line to add?

There are many tools and strategies to solve addition problems, one of which is using a number line! When using a number line to add...

  • Start by drawing a number line.

  • Next, put the larger addend on the left side under the first dash.

  • Then, skip count forward the smaller addend.

  • Finally, the number that you land on is your sum, or the answer to your equation!

Transcript Make a Number Line to Add

: "Okay, we've got it (...) the PERFECT treehouse." : "Now all we need to do is get the materials and BUILD it!" Mr. Squeaks is ready to work (...) but first, he needs to add his materials to make sure he has the right amount of everything. : "Make a Number Line to Add." Mr. Squeaks can use a number line to add his materials together. First, he has twenty-one wood planks and forty-five nails, but he is unsure if he bought enough. He needs to add the number of wood planks and nails together using the number line. When adding using a number line, start by drawing the number line. Then, put the larger addend on the LEFT side under the first dash. We need to put FORTY-FIVE on the LEFT side since it is the largest number. Next, we can skip count forward depending on the other addend (...) here it is twenty-one. We can break twenty apart into two tens and then skip count forward by tens. Let’s skip count (...) ten more than forty-five is fifty-five and ten more than fifty-five is sixty-five. Then, we add smaller amounts for the rest. We only have one left, so we add one more. Finally, we can find our sum by looking at the number that we ended on last. Mr. Squeaks has sixty-six wood planks and nails all together (...) which is enough! Next, Mr. Squeaks is adding his roof tiles. He wants to make a pattern out of the two different colors, but he needs to see how many he has in total. If Mr. Squeaks has thirty-seven orange roof tiles and forty-three blue roof tiles, how many does he have in total? Start by creating an equation and draw the number line. We create thirty-seven plus forty-three. Next, put the larger addend on the LEFT side. The larger addend in this equation is forty-three, so, we'll put it on the LEFT side. Finally, skip count forward by small amounts of the other addend. We can skip count by tens to reach seventy-three and then count on seven. The final step is to find the sum by looking at the number we ended on (...) eighty. That means Mr. Squeaks has eighty roof tiles. Finally, Mr. Squeaks also has some flowers to decorate with. If Mr. Squeaks has sixty-seven blue flowers, and twenty-five orange flowers, how many does he have in all? Remember, we can put the larger addend on the LEFT side. Then, we need to skip count forward the other addend, twenty-five. If we skip count forward small amounts of twenty-five, what number will we land on? We will land on the number ninety-two. Mr. Squeaks has ninety-two flowers in all. Before we see that treehouse, let's summarize. When making a number line to add, remember (...) First, create an equation and draw your number line. Next, put the larger addend on the left side. Then, skip count forward the smaller addend. Finally, the number that you land on is your sum! Now, let's see that treehouse! : "Hmm (...) where did all of my nails go?" : "Imani!"

Make a Number Line to Add exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Make a Number Line to Add.
  • What are the steps to make a number line to add?

    Hints

    What do we need to do before we put the larger addend on the left?

    What do we need to do with the smaller addend in order to get our sum?

    Solution

    First, we draw a number line.

    Second, we put the larger addend on the left. In this problem, 43.

    Third, we skip count the smaller addend. In this problem +10 three times and then +7 (making 37).

    Finally, we find our sum, which in this problem, is 80.

  • Use the number line to find the sum.

    Hints

    Here you can see that 56 + 10 is 66.

    Keep counting up to find your sum!

    Finding your sum is the last step, so look for the last number on the number line to find your solution.

    Solution

    The answer is 88! We put 56, our larger addend, first and count up by 10s and then 2 in order to fill in our number line.

  • Can you use a number line to find the sum?

    Hints

    Remember to start by counting by intervals of 10 to reach your final answer!

    Be sure to identify which is the larger addend and start by putting that on the left.

    Solution

    22 + 34 = 56

    • We put 34 to the left of our number line because it is the larger addend.
    • Then we count up by 10 two times: 44, 54.
    • We have 2 more seeds remaining, so we add those 2 to get our final answer, 56.
    Mr. Squeaks has 56 seeds in total.
  • Can you use a number line to find the sum?

    Hints

    Make sure that you put the largest addend on the left.

    Remember that you need to skip count to find your solution. Use the number line above to help.

    Solution
    • First we find our largest addend 57 and put it on the left of our number line.
    • Then we skip count by 10 three times and reach 87.
    • We still need to add 5 more, which gives us our answer: 92 nails.
    Imani has 92 nails.
  • Solve the word problem.

    Hints

    If Mr. Squeaks has fewer cookies than Imani, that means that Imani has more cookies than Mr. Squeaks, so we need to add these numbers.

    Remember to add all of the cookies. 10 have already been added, how many more need to be added to find the sum?

    Solution

    First, we identify our larger addend, 45 cookies. Then we skip count by 10 to add the 13 more cookies Imani has. This leads us to 55 cookies. We need to add 3 more. Imani has 58 cookies in total.

  • Solve the word problem.

    Hints

    You can separate this problem into two separate number lines on your own if it makes it easier to solve.

    Start with 25 and + 10 three times. You count by 10 three times because you're adding 2 tens from 20 and 1 ten from 12.

    Solution
    • First, we identify our largest addend, 25 bracelets.
    • Then we skip count by 10 to add the 20 more bracelets Imani made. This leads us to 45 bracelets.
    • We then skip count again by 10 to reach 55 bracelets.
    • We need to add 2 more.
    Imani made 57 bracelets total.