3 × 10 on the frame: the three ones rode the lift up to the tens row.
The big ideaTimes ten moves every bead up one row.
How it works
Times ten moves every bead up one row. The lift only goes up.
Beads on the ones row go up to the tens row, and beads on the tens row go up to the hundreds row.
The ones row is then empty, and the empty ones place holds a zero.
Nothing is lost: each bead is now worth ten times as much.
Before the lift: 3 ones.After the lift: 3 tens.
Example 1: 3 × 10, sticker sheets
Ben has 3 sheets, and each sheet holds 10 stickers.
Put 3 ones on the frame, then ride the lift: every bead moves up one row.
Three tens and no ones: 3 × 10 = 30
3 × 10: three tens.
Example 2: 8 × 10, coins into stacks
Each coin turns into a stack of ten.
Eight ones ride up to eight tens.
8 × 10 = 80
8 × 10: eight tens.
Example 3: 12 × 10, three rows
12 is 1 ten and 2 ones.
The ten rides up to the hundreds row and the two ones ride up to the tens row.
One hundred, two tens and no ones: 12 × 10 = 120
12 × 10: one hundred and two tens.
Example 4: 21 × 10, bigger numbers ride too
21 is 2 tens and 1 one.
The tens go up to the hundreds floor, and the one goes up to the tens.
Two hundreds, one ten and no ones: 21 × 10 = 210
21 × 10: two hundreds and one ten.
Example 5: Counting by tens
1 × 10 = 10, 2 × 10 = 20, 3 × 10 = 30
Each answer is one more ten than before.
Counting by tens is the same pattern: 10, 20, 30.
Words to know
times ten
Move every bead up one row.
zero
Says there are no ones, so the ones place is kept.
tens row
The row above the ones. Each bead is worth ten.
hundreds row
The row above the tens. Each bead is worth one hundred.
Watch out
The zero is not magic. It says there are no ones, so the ones place is kept.
Every bead moves up, not just the last one.
Four is only four ones, not four tens. Times ten gives four tens.
Ten tens make one hundred.
Try it
What is 7 × 10?
What is 15 × 10?
The frame shows 6 beads on the tens row and none on the ones row. What number is it?
What does the zero in 90 tell you?
What is 30 × 10?
Answers: 1. 70 · 2. 150 · 3. 60 · 4. there are no ones · 5. 300
Try at homeAsk a grown-up to help you find packs of ten, like ten spoons or ten blocks in a pile. Count how many packs, then say how many things in all by counting in tens.
For grown-upsFind packs of ten at home, like ten spoons or ten blocks in a pile. Count how many packs there are, then say how many things in all by counting in tens.
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