Fun Snowflake Math Challenge
Have a think
849,973 snowflakes fall in an minute.
How many snowflakes fall in a minute:
1) Rounded to the nearest 1,000?
2) Rounded to the nearest 10,000?
3) Rounded to the nearest 100,000?
850,000
850,000
800,000
C L I X
Oh no,
snowflakes have
covered the door
number! We
can’t tell if this is
Alex’s house!
She’s texted me
some clues for us to
use to work out
what her number is:
•
It is written in Roman Numerals.
•
All the digits are odd.
•
In Roman Numerals it is 4 symbols.
•
It is 1 less than 10 times the size of one of
the first 5 square numbers.
1
4
9
Have a think
16
25
10
40
90
160
250
9
39
XXX
IX
89
159
C
L
IX
249
In minutes 1 and 2 combined 450,000 snowflakes fall.
Have a think
9 times as many snowflakes fall in minute 1 than minute 2
1)
How many snowflakes fall in minute 2?
Minute 1
Minute 2
450,000
450,000
÷
10
=
45,000
45,000
45,000
2)
How many more snowflakes fall in minute 1 than 2?
45,000
×
8
=
360,000
360,000
1 mm
1 mm
Estimate the area of the snowflake.
Have a think
3
3
3
3
3
3
3
×
7
=
21 mm
2
Explore a fun math challenge involving snowflakes falling, odd digits, Roman numerals, and snowflake area estimation. Use clues to determine the number of snowflakes falling, decode a Roman numeral door number, and calculate snowflake areas. Play with rounding numbers and comparing snowflake quantities in minutes. Enjoy the snowflake-themed mathematical journey!
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Presentation Transcript
849,973 snowflakes fall in an minute. How many snowflakes fall in a minute: 1) Rounded to the nearest 1,000? 850,000 Have a think 2) Rounded to the nearest 10,000? 850,000 3) Rounded to the nearest 100,000? 800,000
Oh no, All the digits are odd. She s texted me some clues for us to use to work out what her number is: snowflakes have covered the door number! We can t tell if this is Alex s house! It is 1 less than 10 times the size of one of the first 5 square numbers. It is written in Roman Numerals. In Roman Numerals it is 4 symbols. C L I X Have a think 16 25 1 4 9 C L IX 10 40 90 160 250 XXXIX 9 39 89 249 159
In minutes 1 and 2 combined 450,000 snowflakes fall. 9 times as many snowflakes fall in minute 1 than minute 2 45,000 1) How many snowflakes fall in minute 2? 2) How many more snowflakes fall in minute 1 than 2? 360,000 Minute 1 Have a think 450,000 45,000 8 = 360,000 Minute 2 450,000 10 = 45,000 45,000
1 mm 1 mm 3 3 3 3 3 3 Have a think Estimate the area of the snowflake. 7 = 21 mm 2 3
