Area of Rectangles | 3rd Grade PDF Measurement Worksheets - Free Printable

Let’s solve each section step by step.

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Section A: Find the area of each rectangle or square.

Remember: Area = length × width
And don’t forget to write the units with a little “²” (like ft.², in.², yd.²).

1) Example already done: 3 ft. × 2 ft. = 6 ft.²

2) Rectangle: 2 ft. by 4 ft.
→ 2 × 4 = 8 ft.²

3) Square: all sides are 5 ft. (the tick marks mean all sides equal)
→ 5 × 5 = 25 ft.²

4) Rectangle: 8 yd. by 3 yd.
→ 8 × 3 = 24 yd.²

5) Square: side is 7 in.
→ 7 × 7 = 49 in.²

6) Rectangle: 9 in. by 5 in. (even though it’s tilted, multiply the two sides)
→ 9 × 5 = 45 in.²

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Section B: Check which shape has the largest area.

We’ll calculate both areas in each problem and pick the bigger one.

1) Left: 9 ft. × 3 ft. = 27 ft.²
Right: 7 ft. × 4 ft. = 28 ft.² → Right is larger

2) Left: square, 4 yd. × 4 yd. = 16 yd.²
Right: 5 yd. × 3 yd. = 15 yd.² → Left is larger

3) Left: 15 in. × 4 in. = 60 in.²
Right: 8 in. × 7 in. = 56 in.² → Left is larger

4) Left: 13 ft. × 5 ft. = 65 ft.²
Right: square, 80 in. × 80 in. = 6400 in.² — wait! Units are different!

Hold on — we can’t compare feet and inches directly unless we convert. But since the question just says “check the rectangle or square with the largest area,” and doesn’t ask to convert, maybe they expect us to compare numerically? That wouldn’t be fair… but looking at the numbers:

Actually, let’s think: 80 inches is way bigger than 13 feet? Let’s convert to same unit to be sure.

Convert 80 inches to feet: 80 ÷ 12 ≈ 6.67 ft. So area = 6.67 × 6.67 ≈ 44.4 ft.²

Left rectangle: 13 × 5 = 65 ft.² → so left is still bigger.

But wait — maybe the problem expects you to just compute as given? Let me check again.

Actually, no — if one is in feet and one in inches, you must convert to compare fairly. Since 80 in. = 6⅔ ft., then area = (6⅔)² = 44⁴⁄₉ ft.², which is less than 65 ft.².

So left is larger.

BUT — hold on! Maybe I misread. The right shape is labeled “80 in.” on one side — and it’s a square, so both sides 80 in. So area = 80 × 80 = 6400 in.²

Left rectangle: 13 ft × 5 ft = 65 ft²

Now convert 65 ft² to in²: 1 ft² = 144 in² → 65 × 144 = 9360 in²

Wait — now 9360 > 6400 → so left is still bigger.

Alternatively, convert 6400 in² to ft²: 6400 ÷ 144 ≈ 44.44 ft² < 65 ft² → yes, left is bigger.

So for #4, left rectangle has larger area.

But let me double-check my math:

13 ft × 5 ft = 65 ft²
80 in × 80 in = 6400 in²
65 ft² × 144 = 9360 in² → yes, 9360 > 6400 → left wins.

Okay, so answers for Section B:

1) Right shape (28 ft²)
2) Left shape (16 yd²)
3) Left shape (60 in²)
4) Left shape (65 ft²)

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Section C: Find the missing measurement.

Area = length × width → so if you know area and one side, divide to find the other.

1) Area = 54 yd², one side = 6 yd → missing side = 54 ÷ 6 = 9 yd

2) Area = 84 ft², one side = 7 ft → missing side = 84 ÷ 7 = 12 ft

3) Area = 81 in², it’s a square (tick marks), so both sides equal → what number times itself is 81? → 9 × 9 = 81 → so missing side = 9 in

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Final Answer:

Section A:
2) 8 ft.²
3) 25 ft.²
4) 24 yd.²
5) 49 in.²
6) 45 in.²

Section B:
1) Right rectangle
2) Left square
3) Left rectangle
4) Left rectangle

Section C:
1) 9 yd.
2) 12 ft.
3) 9 in.