# Map of Development Multiplication of Whole Numbers Crystal Hampton
Get Started. It's Free Map of Development Multiplication of Whole Numbers ## 2. Strategies

### 2.3. Arrays

2.3.1. Open Arrays

2.3.2. Splitting Arrays into Parts

2.3.3. Compensation 15X15 is easier to do if we change it to 20X15 and remove the extra 75

### 2.4. Partial Product

2.4.1. Decomposing into Tens and Ones 25X 15 can be decomposed into 2X1 and 5X5

2.4.2. By place Value 25X15 can be broken into place values of 20X10 and 5X5

### 2.5. Regrouping

2.5.1. The Associative Property (2X3) X6 = 2 X (3 X 6)

## 5. Grade 4 Curriculum Expectations

### 5.1. Number Sense and Numeration

5.1.1. Multiplication

5.1.1.1. Overall Expectations • solve problems involving the addition, subtraction, multiplication, and division of singleand multidigit whole numbers, and involving the addition and subtraction of decimal numbers to tenths and money amounts, using a variety of strategies; • demonstrate an understanding of proportional reasoning by investigating whole-number unit rates.

5.1.1.1.1. Specific Expectations • multiply to 9 × 9 and divide to 81÷ 9, using a variety of mental strategies; • solve problems involving the multiplication of one-digit whole numbers, using a variety of mental strategies; • multiply whole numbers by 10, 100, and 1000, and divide whole numbers by 10 and 100, using mental strategies; • multiply two-digit whole numbers by one-digit whole numbers, using a variety of tools, student-generated algorithms, and standard algorithms; • use estimation when solving problems involving the addition, subtraction, and multiplication of whole numbers, to help judge the reasonableness of a solution; • describe relationships that involve simple whole-number multiplication; • demonstrate an understanding of simple multiplicative relationships involving unit rates, through investigation using concrete materials and drawings.