AI Tutor
Imagine you are building a giant treehouse! You need 4 wooden planks, and each plank is exactly 1.35 m1.35\text{ m} long.
How do you find the total length of all 4 planks without measuring them one by one? You use decimal multiplication.
To multiply a decimal measurement, you can multiply the numbers just like whole numbers first: 4×135=5404 \times 135 = 540.
Because 1.351.35 has two decimal places, we count two spots from the right in our answer: 540540 becomes 5.40 m5.40\text{ m} (or 5.4 m5.4\text{ m}).
Measuring lengths is fun, but what happens when you need to weigh heavy backpacks for a big camping trip?

Mass in Kilograms (kg)

Mass tells us how heavy something is. We measure everyday mass in kilograms (kg\text{kg}).
Suppose a bakery packs 66 boxes of flour, and each box weighs 2.45 kg2.45\text{ kg}. Let's find the total mass.
First, multiply 6×245=1,4706 \times 245 = 1{,}470. Then put back the two decimal places to get 14.70 kg14.70\text{ kg}.
Now that we can weigh solids and measure lengths, how do we measure liquids like juice and water?

Capacity in Liters (l)