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Abacus · Ages 7+ · Set A
Multiplying by ten
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A
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Goal: 15 min
Score/ 13
Remember: Times ten moves every bead up one row. An empty ones row shows a zero.

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The Tall TowerMia and Ben visited the Tall Tower. It had floors for ones, tens and hundreds. The ground floor was for ones, and the floor above was for tens. The lift only went up. A bead stepped in on the ones floor, rode up one floor and stepped out on the tens floor. On the tens floor stood the ten machine: when one thing dropped in, ten things came out in a neat bunch. Ben had sticker sheets, and every sheet held ten stickers. He had three sheets. Put three ones on the frame, then ride the lift: every bead moves up one row.
1
Ben has 3 sheets of 10 stickers. 3 × 10 =
2
Times ten moves every bead which way?
down one rowup one rowalong the same row
3
Which frame shows 3 × 10 after the lift?
A
B
C
4
Eight coins each turn into a stack of ten. 8 × 10 =
5
The zero in 40 says there are no ones.
TrueFalse

Ride the lift

6
Which number does the frame show?
707700
7
Times ten leaves every bead on the same row.
TrueFalse
8
Twenty-one is 2 tens and 1 one. Every bead rides up one row. 21 × 10 =
9
Which frame shows 12 × 10?
A
B
C
10
Join each times-ten fact to its answer.
  1. 14 × 10
  2. 29 × 10
  3. 315 × 10
  4. 430 × 10
  • A150
  • B300
  • C40
  • D90
11
Ben says 5 × 10 = 5. What did he forget?
To start with the tensTo add a beadTo lift every bead up one row
12
Put the steps in order.
  • Read the number: the ones place holds a zero
  • Put the number on the frame
  • Look at the empty ones row
  • Ride the lift: every bead moves up a row
13
Stretch: Ben has 14 packs of ten stickers. How many stickers is that?
14
Draw the beads for 6 × 10 on the empty frame.
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Answer key · Set A
Multiplying by ten
130 Three ones ride the lift and become three tens: 30.
2up one row The lift only goes up. Every bead rides up one row.
3C The three beads rode up from the ones row to the tens row, so the ones row is empty.
480 Eight ones ride up to eight tens: 80.
5True Four tens and an empty ones row: the zero keeps the ones place.
670 Seven beads on the tens row and none on the ones row make seventy.
7False Every bead rides up one row, so it is worth ten times as much.
8210 The 2 tens go up to the hundreds and the 1 one goes up to the tens: 2 hundreds, 1 ten, no ones.
9A The ten became a hundred and the two ones became two tens, so the ones row is empty.
101-C, 2-D, 3-A, 4-B
11To lift every bead up one row Five ones ride up to five tens, so 5 × 10 = 50.
124, 1, 3, 2 Lift first, then read the new number.
13140 14 is 1 ten and 4 ones. Each bead rides up a row: 1 hundred and 4 tens.
Mark each answer, count the right ones and write the score on the sheet.