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Abacus · Ages 7+ · Set A
Open a ten
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Goal: 15 min
Score/ 14
Remember: Borrow a ten whenever the ones are too few. A ten steps down for ten ones.

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Zoe's braceletMia and Ben ran the bead stall at the school fair. Their counting frame showed forty-three beads: four bags of ten and three loose beads. Zoe wanted nine beads for a bracelet. Mia counted the loose beads, but there were only three. You cannot take nine away from three. Then Ben held up one bag of ten and told Mia to open it. Pop! Ten loose beads rolled out. Now there were three bags and thirteen loose beads. Zoe counted nine beads into her hand. Three bags and four loose beads stayed on the counter.
1
How many beads are left after Zoe takes nine?
2
Mia can take nine beads from three loose beads.
TrueFalse
3
What did Ben tell Mia to open?
one bag of tenall the bagsthe counter
4
After the bag was opened there were three bags and loose beads.

On the frame

Look at the ones first: can you take them away?

5
The ones row of this frame is too short to take away 7. What do you do?
Take away 2 and stopOpen a ten: it steps down for ten onesAdd more tens
6
The frame shows 61. Take away 18. 61 - 18 =
7
The frame shows 83. Take away 47. 83 - 47 =
8
The ones row is empty. 40 - 15 =
9
Which frame shows 43 take away 9? The top row is tens.
A
B
C
10
Circle every sum where you must borrow.
56 - 2352 - 3774 - 3968 - 45

Order, fix it and stretch

11
Number the steps for 43 - 9.
  • Take away the 3 ones you have
  • Take away the 6 that still have to go
  • Read the rows
  • Open a ten: it brings ten ones
12
Ben did 52 - 17 and said 45. What slip did he make?
He took the smaller digit from the bigger one in each rowHe borrowed twiceHe added instead
13
Carrying and borrowing are mirrors of each other.
TrueFalse
14
93 - 67 =
15
Tell a grown-up how you borrow a ten on the frame.
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