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Abacus · Ages 7+ · Set A
Tens with tens, ones with ones
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Goal: 15 min
Score/ 12
Remember: Tens go with tens and ones go with ones, in any order. Say the tens, say the ones, check it makes sense.

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The sticker posterMia and Ben are making a sticker poster. Ben has 43 stickers and Mia has 25. Mia puts 43 on her counting frame: four tens and three ones. She adds the tens first, and two more beads slide across the top row. Then she adds the ones, and five more beads slide across the bottom row. The frame shows six tens and eight ones. Ben tries it the other way round. He adds the ones first and the tens second. He gets the same answer as Mia. Tens first or ones first, the answer is sixty-eight.
1
How many stickers are on the poster in all?
2
Which frame shows Ben's 43 stickers? The top row is tens.
A
B
C
3
Mia added the tens first, so Ben's answer came out different.
TrueFalse
4
Mia slides 5 more beads across for the ones. Which row do they go on?
the tens rowthe ones roweither row

On the frame

Count only the beads slid across to the right.

5
What number does this frame show?
861468
6
The frame shows 34. Add 25 on it. 34 + 25 =
7
The ones row starts empty. 50 + 38 =
8
On the frame, 2 tens and 3 tens make 5 tens.
TrueFalse
9
Join each number to what it is made of.
  1. 143
  2. 225
  3. 368
  • A2 tens and 5 ones
  • B4 tens and 3 ones
  • C6 tens and 8 ones
10
Number Mia's steps, tens first.
  • Read 6 tens and 8 ones
  • Slide 2 tens across the top row
  • Put 43 on the frame
  • Slide 5 ones across the bottom row

Fix it and stretch

11
Ben says 23 + 34 = 75. What did he do?
He added the tens firstHe forgot the onesHe put the tens and ones the wrong way round
12
A frame shows 4 tens and 6 ones. Add 3 tens and 2 ones. How many in all?
13
Draw the beads for 57 on the frame.
14
Say why tens first or ones first gives the same answer.
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