Flash Cards · 3rd Grade · 13 pages
Estimating Sums by Rounding Flash Cards | 3rd Grade Math
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Estimating Sums by Rounding: cut-apart cards for drill, games and home practice. Answer key included.
What’s inside this download
- 13 printable pages of Estimating Sums by Rounding flash cards
- 96 problems for 3rd grade
- Cut-apart cards for drill, games and home practice
- Answer key included
- One print-ready PDF, US Letter
Why choose this over a free worksheet
- Close choices that require careful rounding
- Builds the habit of checking reasonableness
- Keys show the intended rounded sum, so you can tell an estimate from an exact add
Printing, license and file formats
- One PDF, US Letter 8.5 × 11 in. On A4 choose “fit to page”
- One teacher or one household. Print unlimited copies for your own students, this year and next
- Sharing the file itself needs a separate license
- Digital download — nothing ships
How do I get the files?
- The download link is on the order page the moment you pay, and in your inbox at the same time
- Re-download from that link any time — no account needed
- Wrong or broken file? Email support@pencillane.com and we fix it or refund you
Why get the bundle
- Estimating grows with variety. Cards, bingo and color-by-code give children many sums to round.
The problem
25 + 38 is about 70, not 60
Estimating is rounding first and adding second. Children round only one number, round the wrong way, or add the exact numbers.
Rounding 25 down
25 is halfway between 20 and 30 and rounds up to 30. Children hesitate at the 5.
Rounding only one number
Rounding 38 to 40 and keeping 25 gives 65. Both numbers need rounding.
Adding the exact numbers
Some children add 25 + 38 and call it the estimate. The goal is a quick, near answer.
Each question has three close choices, such as 60, 70 and 80. Children round each number to the nearest ten, add the rounded numbers and pick the match.
What’s inside
13 pages of Estimating Sums by Rounding, ready to print.
Cut-apart cards for drill, games and home practice. One instruction line and a name line on every page.
Flash Cards
Cut-apart cards for drill, games and home practice.
Estimating Sums by Rounding
Written for 3rd grade.
Print and go
US Letter, black and white, answer key included.
Look inside
Same layout on every page, so kids stop re-learning the instructions.
How it works
Ready before the printer warms up.
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1
Download
Check out, and your download link is in your inbox and on screen in seconds. One PDF, 13 pages.
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2
Print
Any printer, plain paper, black and white. Print one page or the whole stack.
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3
Hand out
Morning work, centers, small groups, the kitchen table. Same format every day, so the routine sticks.
US Letter 8.5 × 11 · PDFOutcomes
Estimate sums by rounding
Round each number, then add.
- 25 → 30, 38 → 40, 30 + 40 = 70
- 45 → 50, 22 → 20, 50 + 20 = 70
- 65 → 70, 47 → 50, 70 + 50 = 120
- 32 → 30, 27 → 30, 30 + 30 = 60
- 53 → 50, 19 → 20, 50 + 20 = 70
- 86 → 90, 56 → 60, 90 + 60 = 150
- 74 → 70, 17 → 20, 70 + 20 = 90
Who it’s for
Built for the kitchen table and the classroom.
Parents & homeschool
Practice with a shopping list. Round each price to the nearest ten and see about how much it costs.
Teachers
Use in third grade after rounding to ten, as a bridge to checking written answers.
Mental math
Students who round but do not use it get a purpose here.
Questions
Before you buy.
How close are the choices?
Close, such as 60, 70 and 80, so students must round carefully.
Does it include exact adding?
No, the focus is estimates. Exact sums are in our addition sets.
How do I get the file?
The download link appears right after checkout and lands in your inbox at the same time. One PDF with 13 pages. No account needed.
Can I print it more than once?
Yes. One teacher or one household can print unlimited copies for their own students, this year and next.
Will it print in color?
The pages are designed to print in black and white, so they print clean on any home or school printer and do not eat a cartridge.
What if it isn’t right for us?
Email support@pencillane.com within 30 days and we refund the full $5. No form, no questions.
Round first, then add
Estimating Sums by Rounding: cut-apart cards for drill, games and home practice. Answer key included.
Get it — $5