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Grade 3 Math · Level 1, Number Foundations

Subtract Within 1,000

How the lesson starts: Subtract Within 1,000

1. Ember's gem party

   Hello, friend! Meet Ember, a friendly little dragon. She has 564 shiny rubies. At her party, she gives 231 rubies to her friends. How many rubies does Ember keep?

2. Take away by place

   Here are Ember's 564 rubies. She gives away 231. Take away 1 one, 3 tens and 2 hundreds. She keeps 3 hundreds, 3 tens and 3 ones. That's 333!

3. Let's do 352 − 127

   Now 352 − 127. We need to take 7 ones, but there are only 2! So break a ten into 10 ones. Now there are 12 ones. 12 − 7 = 5. Tens: 4 − 2 = 2. Hundreds: 3 − 1 = 2. It's 225!