Question

6. Write how many centimetres in decimal form.
(1) 7 cm 1 mm
(2) 16 mm
(3) 144 mm
(4) 8 mm
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Answer 1

Step-by-step explanation:

1. 7cm=7..., 1mm=1/10cm=7+0.1=7.1 cm

2.16mm= 16/10 cm=1.6cm

3. 144mm=144/10cm= 14.4cm

4. 8mm= 8/10cm = 0.8cm

hope it helps u...

Answer 2

Let us understand units conversion rule first.

• To convert mm (millimeters) into cm (centimeters), we multiply the numerical value by $\mathsf{\dfrac{1}{10}}$

• To convert cm (centimeters) into mm (millimeters), we multiply the numerical value by $\mathsf{10}$

(1) $\underline{\mathsf{7\:cm\:1\:mm}}$

Now, $\mathsf{7\:cm\:1\:mm}$

$\mathsf{=7\:cm+1\:mm}$

$\mathsf{=7\:cm+\dfrac{1}{10}\:cm}$

$\mathsf{=7\:cm+0.1\:cm}$

$\mathsf{=7.1\:cm}$

$\Rightarrow \boxed{\mathsf{7\:cm\:1\:mm=7.1\:cm}}$

(2) $\underline{\mathsf{16\:mm}}$

Now, $\mathsf{16\:mm}$

$\mathsf{=\dfrac{16}{10}\:cm}$

$\mathsf{=1.6\:cm}$

$\Rightarrow \boxed{\mathsf{16\:mm=1.6\:cm}}$

(3) $\underline{\mathsf{144\:mm}}$

Now, $\mathsf{144\:mm}$

$\mathsf{=\dfrac{144}{10}\:cm}$

$\mathsf{=14.4\:cm}$

$\Rightarrow \boxed{\mathsf{144\:mm=14.4\:cm}}$

(4) $\underline{\mathsf{8\:mm}}$

Now, $\mathsf{8\:mm}$

$\mathsf{=\dfrac{8}{10}\:cm}$

$\mathsf{=0.8\:cm}$

$\Rightarrow \boxed{\mathsf{8\:mm=0.8\:cm}}$