Counting Within 1,000
Count within 1000, including skip-counting by 5s, 10s, and 100s
What a learner can do afterwards
- Count forwards and backwards within 1000 from any starting number
- Skip-count by 5s from any multiple of 5 to 1000
- Skip-count by 100s from any number (e.g. 150, 250, 350 …)
1 · Read
Numbers can get very big. You already know how to count by 2s, and you know the hundreds: 100, 200, 300. Now you will count all the way to 1,000, one at a time, by 5s, and by 100s.
Ben has 4 boxes with 100 blocks in each box. He skip-counts the boxes instead of counting every block: 100, 200, 300, 400. He already knows the hundreds, so counting on is fast.
Counting backward works the same way, just take away instead of add. From 400, subtract 100 each time: 400, 300, 200, 100, 0. If you lose your place, say the forward pattern first, then read it backward.
You can count forward or backward, by ones, by fives, or by hundreds, all the way to 1,000.
More to read
1.1 Introduction to Whole Numbers
Counting past hundreds is a road with signposts at every hundred. After 499 comes 500, a round tower with empty tens and ones rooms. Keep walking forward and backward from any start without tripping. Call each number aloud as your finger lands on it.
Add and subtract within 100: FAQ
Fives skipping is a drumbeat: 35, 40, 45, 50, 55. Each beat adds one five, and the ones digit dances 5, 0, 5, 0. Start the beat on any multiple of 5 and ride it to 1000. Clap the beat while a friend calls the numbers.
Count by units of 9 to multiply
Hundreds skipping leaps like a frog: 150, 250, 350, all the way up. Each leap adds one hundred while tens and ones nap undisturbed. Start mid-pond at 175 and leap 275, 375, 475. Count the leaps on fingers so none hop past unseen.
Explore more
2 · Watch
به انگلیسیTake it off screen
Where it sits
Learn first
Optional connections
This opens up
17 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.