The student names the fifth place and reads any 5-digit numeral off an abacus.
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9,999 + 1 = 10,000, and why it needs a fifth digit.
If we have blocks and we add more block, we get blocks.
We read as Ten Thousand.
Four lines that show the same jump happening again and again.
The greatest number with a given count of digits, plus one, is the smallest number with one more digit.
Three questions on 9,999, 10,000 and how many digits each has.
What is one more than the greatest 4-digit number?
Ones, tens, hundreds, thousands, ten thousands - read from the right.
To read a number accurately, we must know the names of the places each digit sits in.
We always start counting places from the right-hand end, not the left.
Four abacus frames from pages 2 and 3, showing 10000, 23141, 61203 and 90000.
An empty rod carries zero value, which gives us the numeral 0 in that place.
The page 2 abacus worked through one rod at a time.
Problem. An abacus has five rods labeled T.Th, Th, H, T, and O from left to right. Moving from left to right, the rods hold 2, 3, 1, 4, and 1 beads. Write and read the numeral.
The same steps for the abacus with one bare rod.
Let's practice reading the next abacus frame starting from the right. The O rod has 3 beads, so that is 3 ones. The T rod is completely bare, meaning it holds tens. The H rod has 2 beads, so it represents 2 . Moving left, the Th rod has 1 bead, which is 1 thousand. Finally, the T.Th rod has 6 beads for 6 ten thousands. Writing the digits from left to right exactly as they appear on the rods gives us the full 5-digit numeral .