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How Many Are Hidden? Blue Snowflakes, Red Snowflakes

The number of snowflakes in both pictures is the same.

How many snowflakes are hidden behind the cloud? How do you know?

How can you finish the equation to make it true?

On the left, 9 blue snowflakes and 9 red snowflakes. On the right, 8 blue snowflakes and an unknown number of red snowflakes behind a cloud. Blue 9 + red 9 = blue 8 + red blank.

What do you notice about how the blue number changed? What about the red number?

Blue 9 + red 9 = blue 8 + red blank. The blue number changed from 9 to 8.
  • Now there are more than 18 snowflakes in both pictures. You get to decide how many!
    How many snowflakes could be hidden behind each cloud? How do you know?
  • Complete the equation to make it true. What do you notice about how the numbers changed?
On the left, 12 red snowflakes and an unknown number of blue snowflakes behind a cloud. On the right, 10 red snowflakes and an unknown number of blue snowflakes behind a cloud. Blue blank + red 12 = blue blank + red 10.
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