# Rounding off numbers

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### Rounding off to the nearest 10 {PowerPoint & Worksheets}

Rounding off to the nearest 10 PowerPoint & Worksheet {Mi

Rounding Numbers --- This is a worksheet for students to practise rounding off numbers to assist them in their estimations. This worksheet explores rounding off by 10's, 100's and 1000's. It is aimed at year 3 and 4 but can be used for year 5 if needed! #reachingteachers

Rounding off numbers allows a student to use estimation to understand large numbers and to quickly check the accuracy of his or her work. I created some cards to help your student learn to round off numbers. There are some examples for them to follow. You can print as many cards as you need. Give them to students who are weak in this topic. Let them practice at home. Please leave a comment if you like my product. Thank you.

This is an image from this resource on the Internet4Classrooms' "Fourth Grade Interactive Math Skills - Estimation" resource page: Rounding Off. A fun game to practice rounding. Choose a level and round off numbers to significant figures, decimals places or the nearest 10, 100 or 1000. Shockwave required for this website.

SMART BOARD - Jack and Jill on Round-Off Hill A cute little lesson that uses visuals to represent how we round off numbers. The ball does not roll down the hill on its own you have to pretend it does and then determine where it will land.

### Number Cards / Number Line {0 - 200} Chevron

$ Number Cards / Number Line {0 - 120} Chevron and Glitter.There is just so much you can do with these cute number cards! - Create a number line for your wall - Play war - Add numbers - Subtract numbers - Round off numbers to the nearest 10 Included: Number cards 0 – 120 Basic operations signs: +, -, x, ÷, = Brackets: ( ) & [ ] Rounding off sign: ≈

### Rounding Numbers with Decimals

How to round off decimals (7). There are times when a number is more precise than needed - with more decimal places. How do you approximate a value like 3.267?

In this JC mother uses an approximate number for the total cost. She explains the concept of rounding off numbers to JC. http://www.youtube.com/watch?v=CaP61n1r1TI

Sieve of Eratosthenes - Grade 8 - Mathematics - This method helps to find out prime numbers up to a given natural number n. Write all natural numbers from 1 to n. 1. The first prime number is 2, leave 2 and round off all the multiples of 2 they are 4,6,8,10,....... the next highest number that is left is 3 and 3 is a prime number. 2. Round off all the multiples of 3. In the remaining numbers which are not being rounded off. They are 9,15,.....