Counting in Pairs (Twos) 2. Move two more beads over to join the first two. How many beads are there on the right side now?
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10 9 8
7 6
5
4 3
2 1
1
3. Follow the pattern from step (2). Can you show six beads on the right-hand side?
A B A C U S
Addition and Subtraction
Using your finger, use the beads to show the correct number of beads as an answer. Example: Start with one bead on the right. Push 2 more beads to the right. Now there are three beads on the right. We can also write this as “1 + 2 = 3”. 1 2 3 4 5 6
7 8 9 10
10 9 8
7 6
5
4 3
1 2 3 4 5 6
2 1
1
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10 9 8
7 6
5
4 3
2 1
1 2
1
2
3
2
Addition
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1. Push 2 beads to the right. How many beads are now on the right? 2 + 2 =?
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10 9 8
7 6
5
4 3
2 1
1 2
Subtraction
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1. Push 1 bead to the left. How many beads remain on the right? 5-1=?
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10 9 8
7 6
5
4 3
2 1
1 5
Multiplication
Set up your abacus so it looks like one of the pictures below, then count out the correct number of beads. ③ 2 x 10 = 20 ①1x1=1 ②2x2=4 1 2 3 4 5 6
7 8 9 10
10 9 8
7 6
5
4 3
1 2 3 4 5 6
2 1
7 8 9 10
10 9 8
7 6
5
4 3
1 2 3 4 5 6
2 1
1
1
1
2
2
2
3
3
3
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4
4
5
5
5
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6
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10
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10 9 8
7 6
5
4 3
2 1
#1188 1 PC
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