Adding Tens
8 tens + 1 ten = ?
80 + 10= ?
8 tens or 80
Use related facts to add and subtract.
20 + ___ = 80
80 - 20= ?
20 + 60 = 80
80 - 20= 60
Write the subtraction number sentence. Then write a related addition fact.
Becky saw 50 green beans in her garden. She picked 20 for dinner. How many green beans are still in the garden?
__ - __= __
__ + __= __
50-20= 30
30+20= 50
30 green beans
6 tens + 4 tens = ?
60 + 40= ?
10 tens or 100
Use related facts to add and subtract.
40 + ___ = 70
70 - 30= ?
40 + 30= 70
70 - 30= 40
Write the subtraction number sentence. Then write a related addition fact.
In the morning, Carter read 80 pages of his book. In the afternoon, he read 10 more pages. How many more pages did Carter read in the morning?
__ - __= __
__+ __= __
80 - 10= 70
10 + 70= 80
70 pages
5 tens + 2 tens = ?
50 + 20= ?
7 tens or 70
Subtract. Then write a related addition fact.
60 - 40= ?
__ + __=__
20
20 + 40= 60 or 40 + 20= 60
Write the subtraction number sentence. Then write a related addition fact.
Kim has 50 shells from her trip to the ocean. She brought 20 to school. How many shells does Kim have at home?
__-__=__
__+__=__
50-20=30
30+20=50
30 shells at home
30 + 30 = ?
40
Subtract. Then write a related addition fact.
90 - 60= ?
__ + __=__
30
30 + 60= 90 or 60 + 30=90
Write the subtraction number sentence. Then write a related addition fact.
Jimmy has 50 toy cars. He lost 10 toy cars. How many toy cars does he have now?
__-__=__
__+__=__
50-10=40
40+10= 50
40 toy cars
5 tens + 6 tens = ?
50 + 60= ?
11 tens or 110
True or false. These facts are related.
70-20= 50
20+40= 60
False.
Write the subtraction number sentence. Then write a related addition fact.
Sam has 80 baseball cards. He gives 20 to his friend. How many cards does Sam have left?
__-__=__
__+__=__
80-20=60
60+20=80
60 cards