Numbers within 10000
Ten hundreds make one thousand, ten thousands make one ten-thousand; ten in a place carries into the next
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Ten hundreds make one thousand, ten thousands make one ten-thousand; ten in a place carries into the next
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On the abacus, ten ones on the ones rod become one bead on the tens rod, and ten tens become one hundred — that is "carry ten into the next place". Build the target number bead by bead, then tap "999 + 1" to see exactly how one more than 999 opens up a brand-new place: the thousands.
Add beads on a four-rod abacus (thousands, hundreds, tens, ones) to build numbers: when a rod fills up with ten, they regroup into one bead on the next rod. Tap "999 + 1" to watch the thousands place being born. Build the target number, read it aloud, and master place value within 10000.