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

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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!"