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Features

Think-first questions before any adding
Which sum needs two trades, and how can you tell?
A worked example with blocks, a chart and the column
Step by step: one place at a time, every new unit in its box
Six mixed sums: tick which places trade, then add
Find the mistake: a forgotten ten and a number lined up wrong
Every page in color and in black and white
Teacher notes for each lesson
Answer keys included

Skills Covered

Add three-digit numbers with two trades
Trade 10 tens for 1 hundred
Add the new ten in before trading the tens

Tell which places will trade before adding
Line up numbers with different digit counts
Find and fix regrouping mistakes

How to Use This Pack

Five pages on sums where the ones make a new ten and the tens, with that new ten, make a new hundred. Page 1 asks students to think before they add. Page 2 asks which sums need two trades, then shows both trades with blocks, a chart and the column. Page 3 works two sums one place at a time. Page 4 mixes sums with one trade, two trades or none, and page 5 asks students to find and explain mistakes and make a sum of their own.

In the Classroom

Build 268 + 157 with blocks: trade the ones first, then count the tens again before trading them. Students who forget the new ten are the most common case; ask "Where is the ten you made from 15 ones?" Page 4 works well as a sort before anyone adds: ones only, tens only, both or none.

At Home

Ask your child which places will trade before they add, and why. Saying "9 tens and 1 more ten make 10 tens, a new hundred" out loud helps.

Tips for Success

Do the ones first, then the tens, then the hundreds
Count the new ten in before you trade the tens
9 tens and a new ten make 10 tens: a new hundred
Line up ones under ones when a number is shorter
Check each column: can a place hold more than 9?

Common Core Standards Alignment

This pack supports the following Common Core State Standards for Mathematics:

2.NBT.B.5 Add and subtract to 100 fluently with place-value strategies, properties of addition, or the link between adding and subtracting.
2.NBT.B.6 Find the sum of two, three or four two-digit numbers using place value and properties of addition.
2.NBT.B.7 Add and subtract to 1,000 with models and place-value strategies, working hundreds, tens and ones separately and regrouping tens or hundreds as needed.
2.NBT.B.9 Tell why an adding or subtracting method gives the right answer, reasoning from place value and number properties.
3.NBT.A.2 Add and subtract to 1,000 fluently using place-value strategies and written methods, properties of addition, and fact-family relationships.

3-Digit Addition: Regrouping Twice

2nd – 3rd Grade

Three-digit addition with two trades in one sum: 10 ones make a ten, and then 10 tens make a hundred. Students spot which places will trade before they add, work one place at a time and find mistakes in other students' work.

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What’s Included

5 worksheets, in color and in black and white
5 answer key pages
2 pages of teacher notes

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