Estimating Using Friendly Numbers - (Rounding to the Nearest Ten) - Mental Math

What others say

"I love how simple this was! It was easier for my students with learning disabilities to understand and they all did really well with this activity!"

McKenna M.

"My students use iready math which doesn’t have a lot of estimating practice. These worksheets helped reinforce this concept for my students. Great resource!"

Nicole F.

Description

I've created six practice worksheets to teach students how to estimate differences and sums by rounding numbers to the nearest ten (i.e. by "using friendly numbers").

Pg. 1 - Rounding Practice (Excluding 5 in the ones place)

Pg. 2 - Rounding Practice (Including 5 in the ones place)

Pg. 3 - Addition with sums to 100 (Excluding 5 in the ones place)

Pg. 4 - Subtraction with differences to 100 (Excluding 5 in the ones place)

Pg. 5 - Addition with sums to 100 (Including 5 in the ones place)

Pg. 6 - Subtraction with differences to 100 (Including 5 in the ones place)

Check out my other mental math products!

Mental Math Strategies Bundle for Addition & Subtraction

Addition & Subtraction Drills Grouped by Mental Math Strategy

Doubles Plus One Mental Math Strategy Pack

Adding & Subtracting Multiples Of Nine Mental Math

Adding & Subtracting Multiples Of Ten Mental Math

Mini Addition Strategy Mental Math Flashcards (Make Your Own)

Addition Strategies Mental Math Poster (Make Your Own)

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Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

Estimating Using Friendly Numbers - (Rounding to the Nearest Ten) - Mental Math

Name: Estimating Using Friendly Numbers - (Rounding to the Nearest Ten) - Mental Math
Brand: ILoveMyJob
SKU: 1698136
Price: 5.50 USD
Availability: InStock
Rating: 4.78 (68 reviews)

ILoveMyJob

383 Followers

$5.50

Highlights

Digital downloads

PDF

Grades

1st - 3rd

Subjects

Basic Operations, Math, Mental Math

Standards

CCSS1.NBT.C.4

CCSS1.NBT.C.6

CCSS2.NBT.B.8

What others say

"I love how simple this was! It was easier for my students with learning disabilities to understand and they all did really well with this activity!"

McKenna M.

"My students use iready math which doesn’t have a lot of estimating practice. These worksheets helped reinforce this concept for my students. Great resource!"

Nicole F.

Description

I've created six practice worksheets to teach students how to estimate differences and sums by rounding numbers to the nearest ten (i.e. by "using friendly numbers").

Pg. 1 - Rounding Practice (Excluding 5 in the ones place)

Pg. 2 - Rounding Practice (Including 5 in the ones place)

Pg. 3 - Addition with sums to 100 (Excluding 5 in the ones place)

Pg. 4 - Subtraction with differences to 100 (Excluding 5 in the ones place)

Pg. 5 - Addition with sums to 100 (Including 5 in the ones place)

Pg. 6 - Subtraction with differences to 100 (Including 5 in the ones place)

Check out my other mental math products!

Mental Math Strategies Bundle for Addition & Subtraction

Addition & Subtraction Drills Grouped by Mental Math Strategy

Doubles Plus One Mental Math Strategy Pack

Adding & Subtracting Multiples Of Nine Mental Math

Adding & Subtracting Multiples Of Ten Mental Math

Mini Addition Strategy Mental Math Flashcards (Make Your Own)

Addition Strategies Mental Math Poster (Make Your Own)

Report this resource to TPT

Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

4.8

Rated 4.78 out of 5, based on 68 reviews

68
ratings

Mostly used with 2nd and 3rd grades

Reviews

2nd

3rd

4th

5th

6th

All verified TPT purchases

Straight-forward and easy to understand

Rated 5 out of 5

October 23, 2025

Met expectations

Great value

Standards-aligned

I love how simple this was! It was easier for my students with learning disabilities to understand and they all did really well with this activity!

McKenna M.

126 reviews

Grades taught: 3rd

Student populations: Autism, Learning difficulties

Friendly Numbers is the Best!

Rated 5 out of 5

October 2, 2025

Met expectations

Great value

Standards-aligned

This is a great way to get students to interact with subtraction problems in different ways.

Peyton L.

46 reviews

Grades taught: 3rd

Student populations: Learning difficulties

Rated 4 out of 5

April 6, 2025

Estimating Using Friendly Numbers - (Rounding to the Nearest Ten) was a great resource for my grade 2/3 class. It was easy to use and really helped my students practice rounding and estimation skills in a fun way.

Emma S.

230 reviews

Grades taught: 2nd, 3rd

Rated 5 out of 5

November 20, 2024

My students use iready math which doesn’t have a lot of estimating practice. These worksheets helped reinforce this concept for my students. Great resource!

Nicole F.

99 reviews

Grades taught: 2nd

Rated 5 out of 5

July 8, 2023

This was very helpful for my 2nd & 3rd grade students during small group instruction to reinforce our skills. I will be using this again!

Jessica B.

153 reviews

Grades taught: 2nd, 3rd

Rated 5 out of 5

June 23, 2023

Wow! These worksheets were so helpful for practicing rounding!

Abby C.

161 reviews

Grades taught: 2nd

Rated 5 out of 5

February 7, 2023

This resource as super fun and my students enjoyed it a lot.

Olivia Geer

(TPT Seller)

356 reviews

Grades taught: 3rd

Rated 4 out of 5

October 19, 2022

This was helpful during our unit on estimating. The students liked it enough, some more than others.

The Trekking Teacher

(TPT Seller)

695 reviews

Grades taught: 2nd

Questions & Answers

Standards

to see state-specific standards (only available in the US).

CCSS1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

CCSS1.NBT.C.6

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

CCSS2.NBT.B.8

Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.