Actual size rulers, 1000 millimeters, 100 centimeters and 40 ... - Free Printable

Let’s carefully check the conversions shown in the image to make sure they are correct.

We are told:
> 1000 millimeters = 100 centimetres = 40 inches

Let’s verify each part step by step.

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Step 1: Convert 1000 millimeters to centimeters

We know:
- 10 millimeters (mm) = 1 centimeter (cm)

So:
→ 1000 mm ÷ 10 = 100 cm ✔
This part is correct.

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Step 2: Convert 100 centimeters to inches

We know:
- 1 inch = 2.54 centimeters (exact conversion)

So:
→ 100 cm ÷ 2.54 ≈ ?

Let’s calculate:

100 ÷ 2.54 = ?

Do the division:

2.54 × 39 = 2.54 × 40 - 2.54 = 101.6 - 2.54 = 99.06 → too low
2.54 × 39.37 = let’s compute:

Actually, standard conversion:
1 meter = 100 cm = 39.37 inches (approximately)

So:
→ 100 cm = 39.37 inches, not 40 inches.

But wait — maybe they’re using a rounded value?

Sometimes people approximate 1 inch ≈ 2.5 cm for simplicity.

If we use 2.5 cm per inch:

→ 100 cm ÷ 2.5 = 40 inches

Ah! So if you round 2.54 to 2.5, then yes — 100 cm becomes 40 inches.

But technically, that’s an approximation.

However, looking at the rulers in the image:

The bottom two rulers are labeled “inch” and go up to 40.

And the top ruler goes to 1000 mm / 100 cm.

So visually, they are aligning 100 cm with 40 inches — which implies they are using the approximation:

1 inch = 2.5 cm (instead of 2.54 cm)

In many school settings or simplified diagrams, this rounding is used for easier mental math.

So while *technically* 100 cm = 39.37 inches, in this context — since the diagram shows it as 40 inches — we can assume they want us to accept the approximation.

Also, note: 40 inches × 2.54 = 101.6 cm — which is more than 100 cm.

But again — if we use 2.5 cm/inch → 40 × 2.5 = 100 cm exactly.

So for educational purposes here, especially since the image presents them as equal, we’ll go with the intended equivalence.

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✔ Final verification:

- 1000 mm = 100 cm → Correct (by definition)
- 100 cm = 40 inches → Only true if using 1 inch = 2.5 cm (approximation)

Since the problem presents them as equal, and likely expects students to understand basic metric-imperial approximations, we accept it as given.

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Final Answer:
The statement "1000 millimeters = 100 centimetres = 40 inches" is approximately correct when using the simplified conversion of 1 inch = 2.5 centimeters. While the exact conversion gives 100 cm ≈ 39.37 inches, the value 40 inches is commonly used in educational contexts for simplicity.