Page 144 - NUMINO TG_2A
P. 144
09Math Balance Unit
Material Math Balance
Objective: Practice and review addition and subtraction
Put a weight on the math balance to make it level. Have students discuss how they can find a
place to put the weight and level the math
Write the number in . 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 balance.
What you need: Math Balance Have students place the weights of 1
through 10 one at a time on the math
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 balance.
Have them put the weights on the math
10=4+ 6 9=5+ 4 balance to make it level so the total
weight on the left equals the total weight
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 on the right.
8+6=5+ 9 6+ 10 =7+9 After students have learned to use the equal
sign ( ) to indicate that the balance is
Chat leveled, have them express equal weights
Discuss how you can find the place to put the weight and level using addition sentences.
the math balance. Have students use the math balance, as
shown in the diagram.
To balance the scale, the weights on both sides of the scale must be equal.
So, if the placement of the weights on the left equals to 9, the placement Put the weights on the math balance as shown
of the weights on the right must also equals to 9. in the first picture on page 77. Point to the
math balance and ask the following questions.
9. Math Balance 77 Which way is the balance leaning? To the
left.
Where are the weights placed? They are
placed on 10 on the left, and on 4 on the right.
Say, we are trying to even out the
balance. Make an addition sentence to
express this. 10 4 .
So, where do we need to place another
weight? We need to place another weight
on 6 on the right.
So, what goes into the ? 6.
Problem: Put 2 weights on the math balance to make it level. Write the correct number in the blanks.
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10
953
Solution: 9 5 14. So 14 3 , 11
The 2 numbers that add up to 11 are 1 and 10, 2 and 9, 4 and 7, 5 and 6.
Answer: 9 5 3 1 10 , 9 5 3 2 9 , 9 5 3 4 7 , 9 5 3 5 6
2A Unit 09 127
Material Math Balance
Objective: Practice and review addition and subtraction
Put a weight on the math balance to make it level. Have students discuss how they can find a
place to put the weight and level the math
Write the number in . 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 balance.
What you need: Math Balance Have students place the weights of 1
through 10 one at a time on the math
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 balance.
Have them put the weights on the math
10=4+ 6 9=5+ 4 balance to make it level so the total
weight on the left equals the total weight
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 on the right.
8+6=5+ 9 6+ 10 =7+9 After students have learned to use the equal
sign ( ) to indicate that the balance is
Chat leveled, have them express equal weights
Discuss how you can find the place to put the weight and level using addition sentences.
the math balance. Have students use the math balance, as
shown in the diagram.
To balance the scale, the weights on both sides of the scale must be equal.
So, if the placement of the weights on the left equals to 9, the placement Put the weights on the math balance as shown
of the weights on the right must also equals to 9. in the first picture on page 77. Point to the
math balance and ask the following questions.
9. Math Balance 77 Which way is the balance leaning? To the
left.
Where are the weights placed? They are
placed on 10 on the left, and on 4 on the right.
Say, we are trying to even out the
balance. Make an addition sentence to
express this. 10 4 .
So, where do we need to place another
weight? We need to place another weight
on 6 on the right.
So, what goes into the ? 6.
Problem: Put 2 weights on the math balance to make it level. Write the correct number in the blanks.
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10
953
Solution: 9 5 14. So 14 3 , 11
The 2 numbers that add up to 11 are 1 and 10, 2 and 9, 4 and 7, 5 and 6.
Answer: 9 5 3 1 10 , 9 5 3 2 9 , 9 5 3 4 7 , 9 5 3 5 6
2A Unit 09 127
