Five pages that take three-digit addition from blocks to the written method. Page 1 shows two numbers in base-ten blocks (flats, rods and cubes) that need no trading: students count the hundreds, tens and ones and write the sum. Page 2 shows two numbers as quick drawings, a square for a hundred, a stick for a ten and a circle for a one: students write all the hundreds, tens and ones in a table (5 hundreds 8 tens 13 ones), then trade (5 hundreds 9 tens 3 ones) and write the sum. Page 3 adds with partial sums: the hundreds, the tens and the ones, then the three parts (356 + 248 = 500 + 90 + 14 = 604). Page 4 is twelve column problems, regrouping in the ones, the tens or both; the key shows every carried 1. Page 5 has four more column problems, then three "Who is right?" problems with common mistakes: forgetting to carry, writing 14 ones as two digits (5714), and lining a two-digit number up under the hundreds (352 + 46 = 812). Each page starts with a worked example.
Before page 2, have students make their own quick drawings of 256 and 137 on whiteboards and circle ten ones. Ask what the circle becomes (a new stick) before anyone writes. Connect page 3 to page 4: the 14 in the ones part is the 4 written down and the 1 carried.
Add prices with your child: a $256 bike and a $137 helmet. Write the hundreds, tens and ones separately, then put them together. Ask how they know the answer makes sense (about 250 + 150 = 400).
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
A 5-page 2nd grade pack for adding three-digit numbers within 1,000. Count two numbers in base-ten blocks, then use quick drawings and a place value table to trade 10 ones for a ten or 10 tens for a hundred. Add with partial sums (356 + 248 = 500 + 90 + 14 = 604) and in columns with regrouping in the ones, the tens or both. Last, decide which animal is right: one forgot to carry, one wrote 14 ones as two digits, one lined up a two-digit number under the hundreds. Every page comes in color and in black and white. Answer keys included.
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