# Multiply Two-Digit Numbers

Videos to help Grade 4 students learn how to multiply two-digit multiples of 10 by two-digit numbers using a place value chart.

Common Core Standards: 4.NBT.5, 4.OA.3, 4.MD.3

## New York State Common Core Math Module 3, Grade 4, Lesson 34

### NYS Math Module 3 Grade 4 Lesson 34 Concept Development

Problem 1: Discover that 4 × 10 × 22 and 40 × 22 represent the same amount.
Problem 2: Multiply 40 × 22 using a place value chart.
Problem 3: Multiply 50 × 31 using a place value chart.
Problem 4: Multiply 50 × 31 without using a place value chart.

### NYS Math Module 3 Grade 4 Lesson 34 Problem Set

1. c. 30 × 37
= (3 × ____ ) × _____
= 3 × (10 × _____ )
= _______

### NYS Math Module 3 Grade 4 Lesson 34 Problem Set

1. Use the associative property to rewrite each expression. Solve using disks and then complete the number sentences.
a. 30 x 24
b. 40 x 43
c. 30 x 37

### NYS Math Module 3 Grade 4 Lesson 34 Application Problem

Mr. Goggins planted 10 rows of beans, 10 rows of squash, 10 rows of tomatoes, and 10 rows of cucumbers in his garden. He put 22 plants in each row. Draw an area model, label each part, and then write an expression that represents the total number of plants in the garden.

### NYS Math Module 3 Grade 4 Lesson 34 Homework

1. Use the associative property to rewrite each expression. Solve using disks and then complete the number sentences.
2. Use the associative property and number disks to solve.
3. Use the associative property without number disks to solve.
4. Use the distributive property to solve the following. Distribute the second factor.