## Multiplying Decimals with Whole Number

#### How to Multiply Decimals with Whole Number?

**Step 1:**Multiply the hundredths.

**Step 2:**Multiply and add the tenths.

**Step 3:**Multiply and add the ones.

See working examples below.

#### 1. Bob had 3 packets of butter each containing 0.4 kg butter.

How much butter did Bob have altogether?

**Method 1:**

0.4 + 0.4 + 0.4 = 1.2 kg

Bob had

**1.2 kg**of butter altogether.

**Method 2:**

Multiply 0.4 kg by 3.

0.4 × 3 = ?

Bob had

**1.2 kg**of butter altogether.

#### 2. Bob had 3 cartons of milk each containing 0.45 L of milk.

How much milk did Bob have altogether?

Multiply 0.45 L by 3.

0.45 × 3 = ?

Bob had

0.45 × 3 = ?

Bob had

**1.35 L**of milk altogether.#### 3. Bob had 7 bags of flour each containing 1.85 kg flour.

How much flour did Bob have altogether?

Multiply 1.85 kg by 7.

1.85 × 7 = ?

Bob had

1.85 × 7 = ?

Bob had

**12.95 kg**of flour altogether.#### 4. Serena bought 5 drawing books for $4.25 each.

How much did she spend on the drawing books altogether?

Cost of 1 drawing book = $4.25

Cost of 5 drawing books = $4.25 × 5

= $21.25

She spent $21.25 on the drawing books altogether.

= $21.25

She spent $21.25 on the drawing books altogether.