Scale conversions: Use this foundation to estimate weights easily; for example, 10 kg ≈ 22 lbs, 100 kg ≈ 220 lbs. Practice with real-world examples: The more you apply these conversions in ...

Another helpful memory device is remembering common conversions: 1 kg ≈ 2.2 lbs, 5 kg ≈ 11 lbs, 10 kg ≈ 22 lbs. These reference points can help you quickly estimate other conversions.

I often need to convert pounds to kilograms when calculating pediatric doses. To do so, subtract the first digit of the patient’s weight from the total number of pounds and divide by two.

To convert from kilograms to grams, you do the opposite - you multiply by 1,000. You may also find a bar model helpful when converting grams and kilograms.

Teacher Notes. This could be used for solving problems which require conversions between grams and kilograms. Pupils could be given opportunities to estimate and weigh real objects and use scales.

Developing mental calculation skills helps when precise conversions aren't necessary: Estimating kilograms to pounds: Double the kilogram value and add about 10% more. For 15 kg: (15 × 2) + 3 ...