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Posts Tagged ‘length’
Zombie MathZ 6: Simultaneous Zombies & Decimals
May 1, 2025
How GEOMETRY gave Margot Robbie her long Barbie legs
July 30, 2023
OMG! Credit Card Antenna Geometry is so cool + some PIN Probability
January 24, 2023The world has mostly agreed on the size of a credit card:
Credit cards today contain a microchip and aerial.
A credit card is dissolved in ACETONE (solvent found in some nail polish removers) to extract the chip & aerial in this BBC video.
OMG! The cardless chip still works to pay for coffee. But if you wanted cash you would still need the PIN.
Outdoor Math Adventures: Grade 3 – 5
September 16, 2022It’s Autumn in UK & FALL in the USA so it’s the perfect time for a little bit of outdoor math for Grade 3-5 with AUTUMN leaves. Of course, you don’t need FALL LEAVES for this exercise, but it is colorful.
This fab idea comes from Juliet Robertson, an outdoor education consultant in Scotland. Her blog Creative star learning is one of the most inspiring outdoor maths blogs you will find.
Check out Mathpig’s protractor joke here.
Another fab idea from Juliet Robertson.
Outdoor Math Adventures: Grade 3 – 5
September 12, 2019It’s Autumn in UK & FALL in the USA so it’s the perfect time for a little bit of outdoor math for Grade 3-5 with AUTUMN leaves. Of course, you don’t need FALL LEAVES for this exercise, but it is colorful.
This fab idea comes from Juliet Robertson, an outdoor education consultant in Scotland. Her blog Creative star learning is one of the most inspiring outdoor maths blogs you will find.
Check out Mathpig’s protractor joke here.
Another fab idea from Juliet Robertson.
Math Joke 3:How long will it take you to grow a really bad 70s-styles haircut?
February 18, 2019
The follicle diagram (above) came from bgoffforensics blog. More on hair growth rates here.
QUESTION 1:
How long to grow that really bad 70s style hair cut?
The length of Fabio’s hair (below) is approx 50cm.
t = 50/1.25 months
t=40 months
t = 3 Years 4 months!!!!
Is it worth the effort? Ha!
QUESTION 2: 
The growth rates of 1.25 cm/month or 0.5 inches/month are rounded off. Calculations using these growth rates will produce different answers for very large numbers (as above). Read more about the above story in the Daily Mail, UK here. By the way, Asha has been growing her hair for 25 years. Her hair weighs 3 stone or 19 kg. You can find more hair records including the World’s longest ear hair here.
QUESTION 3:
Natasha lives in Rio de Janeiro, Brazil. Read more about Natasha in the Daily Mail here. Once again Mathspig has rounded off the length of hair for easy calculation. The Daily Mail puts Natasha’s ‘mane’ at 5 feet 2 inches or 157 cm. This is the length of hair to be cut off. So Mathspig adjusted the length to 180cm or the approx length of her longest hair.
Sasha a little dog with a BIG, BIG ID Number!
March 28, 2018This exercise works best if for homework the middle school students count the digits in their own cell phone, passport, bill code or some other number. They don’t have to show the passport or bill. They just have to count the digits.
Hair Maths 3: How OLD is your hair?
April 30, 2015
The follicle diagram (above) came from bgoffforensics blog. More on hair growth rates here.
QUESTION 1:
QUESTION 2:
The growth rates of 1.25 cm/month or 0.5 inches/month are rounded off. Calculations using these growth rates will produce different answers for very large numbers (as above). Read more about the above story in the Daily Mail, UK here. By the way, Asha has been growing her hair for 25 years. Her hair weighs 3 stone or 19 kg. You can find more hair records including the World’s longest ear hair here.
QUESTION 3:
Natasha lives in Rio de Janeiro, Brazil. Read more about Natasha in the Daily Mail here. Once again Mathspig has rounded off the length of hair for easy calculation. The Daily Mail puts Natasha’s ‘mane’ at 5 feet 2 inches or 157 cm. This is the length of hair to be cut off. So Mathspig adjusted the length to 180cm or the approx length of her longest hair.
Mathspig Blog 