lesson 1 & 2
there are 5 squirrels playing. 3 squirrels run away. how many squirrels are still playing?
2
I bought 6 pairs of sunglasses. I broke 3 of them on my way home. How many do I have left?
3
what is 17-9?
8
what is 13-7?
6
what number sentence shows a missing addend?
8+2=10 OR 8+__=10
8+___=10
a store has 11 beach balls. they sell 2 of them. how many do they have left?
9
is 17-8=9 a doubles fact?
no
the known part is 5.
what is the missing part?
8
there are 16 children flying kites. 9 children went home. how many are left flying kites?
7
count back...
10, ____, ____, _____, _____
9, 8, 7 ,6
8
name one strategy you can use to subtract.
name more than one to double the points.
(answers may vary)
doubles facts, REKNREK, count back, count on, using fingers......
In the fact family 10, 8 and 2, which number goes on top of the triangle?
10
what number is the difference?
9-4=5
5
use doubles to solve
10+10
20-10
20
10
12 sharks are swimming. 4 of them swim away. how many are left swimming?
8
I found 14 shells on the beach. I lost the same amount of shells that I found. What doubles fact can tell me how many shells i have left?
7+7=14
numbers
what is a fact family
addition and subtraction numbers that use the same numbers
(answers can vary)
start at a number and _____ to subtract.
count on OR count back
count back
describe how to count back
start on number line, with the greatest number start counting back
(answers can vary)
what part of a story problem do you underline? What part do you circle?
underline what you know
circle what you need to find out
to find the missing part subtract the known part from the _______.
whole
how can you find a missing addend
using subtraction number sentences
(answers can vary)
Make a ten to subtract
12-5
answers vary