Rounding using a number line (tens)

Skylar and Henry are participating in a frisbee competition where the top three finishers will receive all you can carry toffee apples! They get one throw each. The spot where the frisbee lands is rounded to the nearest ten, and this becomes their score. Skylar steps up for her throw. Now it is Henry's turn. Their fierce competitor, Benji, throws last. To calculate their scores we can use "Rounding to the Nearest Ten on a Number Line" When rounding to the nearest ten on a number line, first, "identify the number you are rounding". Next, "set up the number line with the ten before your number on the left and the ten after your number on the right". Then "fill in all the numbers between the tens". The number line is ready, so we "plot the number" we are rounding on to it. If the "number" is "BELOW halfway", we "round DOWN" to the nearest ten, and if the "number" is "HALFWAY or ABOVE", we "round UP" to the nearest ten. Let's practice with Benji's throw! HERE is where Benji's throw landed. First, identify the number we are using, which is forty-five. The ten before forty five is forty, so write it on the LEFT hand side.. and the ten after forty five is fifty, so write it on the RIGHT hand side. Now fill in the number line with all of the numbers between forty and fifty. Benji scored forty-five, so we can plot it HERE on the number line. We can see that forty-five is at the HALFWAY point on the number line, so we round UP to fifty. Forty-five rounded to the nearest ten is fifty.

Let's see if you can help calculate Skylar and Henry's scores! Here is where Skylar's frisbee landed. Can you identify the number?

It is seventy-six. Which ten comes before seventy six and which ten comes after?

The ten before seventy six is SEVENTY, and the ten after is EIGHTY. Now we fill in all of the numbers BETWEEN seventy and eighty. Can you remember the next step?

We plot Skylar's frisbee throw, so seventy-six goes HERE. Now we need to decide if we round UP, or round DOWN. What should we do for Skylar's score?

Seventy-six is OVER halfway on the number line, so we round UP to the nearest ten. Seventy-six rounded to the nearest ten is EIGHTY. Now let's calculate Henry's score! Here is where Henry's frisbee landed. What is the number?

It is sixty-four. Which ten comes before sixty four and which ten comes after?

The ten before sixty four is SIXTY, and the ten after is SEVENTY. Now we fill in all of the numbers BETWEEN sixty and seventy. What is the next step?

We plot Henry's frisbee throw, so sixty-four goes HERE. Now we need to decide if we round UP, or round DOWN. Which should we choose for Henry's score?

Sixty-four is BELOW halfway on the number line, so we round DOWN to the nearest ten. Sixty-four rounded to the nearest ten is SIXTY.

Remember, to round to the nearest ten on a number line, first, "identify the number you are rounding". Next, "set up the number line with the ten before your number on the left and the ten after your number on the right". Then "fill in all of the numbers between the tens". Now the number line is ready, we "plot the number" we are rounding "on the number line". If the "number" is "BELOW halfway", we "round DOWN" to the nearest ten, and if the "number" is "HALFWAY or ABOVE", we "round UP" to the nearest ten. Well, it looks like Skylar was the overall winner. Great job, Skylar! But don't forget, everyone in the top three gets all you can carry toffee apples. Wow, Benji and Henry, you have both got a lot of toffee apples there!

Of course, Skylar. Cunning as always!