Converting between pounds and kilograms

Presentation

•

Mathematics

•

1st - 12th Grade

•

Easy

•

CCSS

5.MD.A.1, 2.MD.A.2, 4.MD.A.1

Standards-aligned

Katherine Furgeson

Used 5+ times

FREE Resource

15 Slides • 4 Questions

Converting between pounds and kilograms

Multiply or divide by 2.2

About how many pounds do you think this toddler weighs?

5 lbs
10 lbs
20 lbs
40 lbs

The average one year old toddler weighs about 20 pounds

In a medical emergency, it is important to know how to estimate weight.

You may not have time to use a scale.

About how much would an average 6'0" male weigh?

100 pounds
125 pounds
165 pounds
200 pounds

The AVERAGE 6'0" tall male may weigh around 165 pounds.

In the medical field you need to be able to convert from pounds to kilograms because the metric system is used in science and medicine.

To convert FROM pounds TO kilograms you divide by 2.2.

Let's look back at the toddler. How many kilograms do you think the 20 pound toddler weighs?

(hint: divide by 2.2)

If we take the number of pounds and divide by 2.2 we get 9.0 and that's how many kilograms he weighs.

Think back at the average 6'0" male who weighs 165 pounds. How many kilograms is that?

Remember to divide by 2.2 and express your answer to the tenths place.

If we take 165 pounds and divide that number by 2.2 we get 75.0. That male would weigh 75 kilograms.

To go from kilograms to pounds we simply do the opposite: we MULTIPLY by 2.2

This 5 year old boy weighs 18.1 kilograms. How many pounds does he weigh?

18.1 lbs
25.4 lbs
29.2 lbs
39.8 lbs

This 5 year old boy weighs 39.8 pounds.

You'll need to know both lbs and kg because your place of employment will want the value expressed in kg but the parents or patient will want to know pounds.

Multiple Choice

If a patient says she weighs 145 pounds, how many kg is that?

54.1 kg

65.9 kg

74.3 kg

82.6 kg

Multiple Choice

If a scale at a hospital says the patient weighs 54.3 kg, how many pounds is that?

119.4 pounds

100.5 pounds

97.1 pounds

Multiple Choice

To go from pounds to kilograms you ________________ by 2.2.

Multiply

Divide

Multiple Choice

TO go from kilograms to pounds you ________________ by 2.2.

Multiply

Divide

Converting between pounds and kilograms

Multiply or divide by 2.2

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