Friday, 26 October 2018

Rounding numbers

Success Criteria -
• I must remember to add the numbers before and after
• I must look for the number given - hundredth/tens/thousands

4, 897, 542.854

Round the number to the….
1 - Nearest thousands
I will look at the number in the thousands place, which is 7. Now I will substitute all of the numbers after 7 with the number 0. Now the number will become 4, 897000. I know that this is the thousands number before 4, 897, 542.854. The number after that will be 4, 898000. I will look at the number after 7, which is 5, and now I know to round up. The nearest thousand is 4, 898000.
2 - Nearest tenths
The nearest tenth is 4, 897, 542.900. I know this because I looked at the number in the tenths place, which is 8. I then substituted the numbers after with 0. The number became 4, 897, 542.800, which is the number before. The tenths number after 4, 897, 542.854 is 4, 897, 542.900. I then looked at the number after 8, which was 5. 5 indicates that I should round up. That is how I got my answer.
3 - Nearest ten thousands
I will first look at the number in the ten thousands place, which is 9, and all of the numbers after 9 will become 0. The number is now 4, 890000. This is the number before 4, 897, 542.854. The number after would be 4, 90000. I will look at the number after 9, which is 7. This means I will round up to 4, 90000.
4 - Nearest hundreths
Since I am rounding to the nearest hundredths number, I will look at the number in the hundredths place, which is 5. I will now change all of the numbers after to 0. The number is now 4, 897, 542.850, which is the number before. The number after would be 4, 897, 542.860. Now I will look at the number after 5, which is 4. 4 Shows me that I must round down. The answer is 4, 897, 542.850.
5 - Nearest tens
My answer is 4, 897, 540. This is because I looked at the number in the tens place, which is 4. Then I made all of the other whole numbers after this to 0. The number became 4, 897, 540. This would be the number before, and the number after would be 4, 897, 550. Now I will look at the number after 4, which is 2, and 2 indicates that I must round down. Therefore, my answer is, again, 4, 897, 540.
6 - Nearest whole number
To find the nearest whole number, I will first look at the last whole digit in this number, which is 2. I will not worry about the numbers after the decimal point, because those numbers are not whole numbers. But I will look at the number in the tenths place, which is 8. 8 will help me to decide whether to round up or down. SInce 8 is bigger than 5, I will round up to the nearest whole number, which is 4, 897, 543.
7 - Nearest hundreds
My answer is 4, 897, 500 because I did this. First, I looked at the number in the hundreds place, which is 5, and then I made all of the numbers after 5 become 0. The number changed to 4, 897, 500, which I decided, was the tens number before the original number. The number after that is 4, 897, 600. After I did this, I looked at the number after 5, which was 4, and 4 is less than 5 so I rounded down to get my answer!

Today I learned how to round numbers to the nearest ten, hundred, thousand and much more. It was fun learning about these things, and we also did an activity on rounding.