lesson
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Imagine having 30 loose marbles rolling all over your desk. Counting them one by one takes a long time!
What if you could lock them together into neat stacks to count them in just three seconds?
Making a Ten
A single small block is called a unit cube, and it has a value of 1.
When you snap 10 unit cubes together into a tall line, you build a ten rod.
📊Create an interactive visual diagram demonstrating place value with base-ten blocks. Left side: 10 small yellow unit cubes scattered, each labeled '1'. An arrow in the center points right with the label 'Snap together!'. Right side: 1 tall vertical blue rod made of 10 connected segments, labeled '1 Ten Rod = 10'. Below, a clear callout banner reads: '10 Ones = 1 Ten'. Use bright child-friendly colors, rounded corners, clear bold text, and a clean white/light-gray card background.
One rod always holds 10 cubes, so 1 ten has the exact same value as 10 ones.
What happens when you have a whole handful of rods?
Counting by Tens
Instead of counting every tiny square, you can skip-count by tens!
Each new rod adds 10 more: 10, 20, 30, 40, and so on.
📊Create a visual counting chart with base-ten rods displayed in horizontal rows or cards. Row 1: 1 blue ten rod with a bubble reading '1 ten = 10'. Row 2: 2 blue ten rods side-by-side with a bubble reading '2 tens = 20'. Row 3: 3 blue ten rods with a bubble reading '3 tens = 30'. Row 4: 4 blue ten rods with a bubble reading '4 tens = 40'. Each rod clearly shows its 10 segmented square parts. Use clean cards, large friendly numbers, and colorful badges.
If you see 4 ten rods, count them out: 10, 20, 30, 40.