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09Unit Math Balance
jOb ective Use math balance to complete addition sentences.
1. Textbook Instructions Unit
Have students think about the purpose of 09 Math Balance
balancing the tilted math balance.
Weights are put on a math balance.
Put the weights on the math balance like in
the picture on p.76, and ask the following 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10
questions.
What kind of equipment is this? It is a math Which side does the math balance lean towards?
balance.
Where are the weights placed on the math The math balance leans to the left.
balance? The weights are placed on 9 on the
left and on 4 on the right. Add 1 weight to one side of the math balance to make it level.
To which side does the math balance Where do you have to put the weight?
lean? It leans to the left.
What does it mean when it leans to the A weight must be added to ‘5’ on the right side.
left? The left side is heavier. You have to put on 5.
Where must we put another weight in
order to level the math balance? Put the The equal sign (=) shows that both sides are
weight on 5 on the right side. the same.
Place the weight on 5 on the right side, and If the balance is leveled, the weights on both
ask the following questions. sides are the same.
How has it changed? The math balance is So, you can write a number sentence with the
leveled out. equal sign.
What does it mean when a math balance is
leveled out? 76
The weights on both sides are the same.
What is the sum of the 2 weights on the
right? 9.
Are the weights on the left side and right
side the same? Yes, they are.
2. Build Understanding
Terms used for comparing 2 numbers
When comparing 2 numbers, we can use “more than ( ),” “less than ( ),” or “equal to ( ).”
“More than ( )” and “less than ( )” are opposite terms, and when the numbers are equal, we use the
“equal to ( )” sign.
AB CD EF
126 NUMINO Teacher s Guide
jOb ective Use math balance to complete addition sentences.
1. Textbook Instructions Unit
Have students think about the purpose of 09 Math Balance
balancing the tilted math balance.
Weights are put on a math balance.
Put the weights on the math balance like in
the picture on p.76, and ask the following 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10
questions.
What kind of equipment is this? It is a math Which side does the math balance lean towards?
balance.
Where are the weights placed on the math The math balance leans to the left.
balance? The weights are placed on 9 on the
left and on 4 on the right. Add 1 weight to one side of the math balance to make it level.
To which side does the math balance Where do you have to put the weight?
lean? It leans to the left.
What does it mean when it leans to the A weight must be added to ‘5’ on the right side.
left? The left side is heavier. You have to put on 5.
Where must we put another weight in
order to level the math balance? Put the The equal sign (=) shows that both sides are
weight on 5 on the right side. the same.
Place the weight on 5 on the right side, and If the balance is leveled, the weights on both
ask the following questions. sides are the same.
How has it changed? The math balance is So, you can write a number sentence with the
leveled out. equal sign.
What does it mean when a math balance is
leveled out? 76
The weights on both sides are the same.
What is the sum of the 2 weights on the
right? 9.
Are the weights on the left side and right
side the same? Yes, they are.
2. Build Understanding
Terms used for comparing 2 numbers
When comparing 2 numbers, we can use “more than ( ),” “less than ( ),” or “equal to ( ).”
“More than ( )” and “less than ( )” are opposite terms, and when the numbers are equal, we use the
“equal to ( )” sign.
AB CD EF
126 NUMINO Teacher s Guide
