Free math video lessons with examples and worked solutions to help Grade 3 students learn how to add measurements using the standard algorithm to compose larger units twice.

Common Core Standards: 3.NBT.2,
3.NBT.1,
3.MD.1,
3.MD.2

Application Problem

Josh’s apple weighs 93 grams. His pear weighs 152 grams.

What is the total weight of the apple and the pear?

Use the standard algorithm to compose larger units once.

Concept Development

Bag A has 266 grams of beans, and Bag B has 158 grams of beans.

Use our place value charts and disks to figure out how many grams of beans we have altogether.

For bag B, put 8 ones disks in the ones column, 5 tens disks in the tens column, and 1 hundreds disk in the hundreds column.

For bag A, place 6 ones disks, 6 tens disks, and 2 hundreds disks in respective columns.

Move the disks to add 266 grams to 158 grams.
Homework

1. Find the sums below.

a. 47 m + 8 m

f. 463 mL + 179mL

j. 4 L 342 mL + 2 L 214 mL

Application Problem

Josh’s apple weighs 93 grams. His pear weighs 152 grams.

What is the total weight of the apple and the pear?

Use the standard algorithm to compose larger units once.

Concept Development

Bag A has 266 grams of beans, and Bag B has 158 grams of beans.

Use our place value charts and disks to figure out how many grams of beans we have altogether.

For bag B, put 8 ones disks in the ones column, 5 tens disks in the tens column, and 1 hundreds disk in the hundreds column.

For bag A, place 6 ones disks, 6 tens disks, and 2 hundreds disks in respective columns.

Move the disks to add 266 grams to 158 grams.

1. Find the sums below.

a. 47 m + 8 m

f. 463 mL + 179mL

j. 4 L 342 mL + 2 L 214 mL

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