Addition
In the number 43 what does the 4 represent?
tens place
7 + 6
13
8-3
5
45 + 38
83
If 15-7 = 8 how can we check the answer?
add 8 + 7
23 + 12 using place values?
35
24 + 18
42
15-7
8
22-13
9
12 - 5 = ? Check it with addition
7
7 + 5 = 12
If Sam has 24 marbles and his friend gives him 13 more, how many does he have?
37
39 + 25
64
20-5
15
84-29
55
30 - 18 = 12, how do you check it?
add 12 + 18 = 30
45 + 32
77
What is the first step to add 47 + 36?
add the ones place first 7 + 6
40-23
17
What does it mean to decompose a number?
Break it into smaller parts
Solve 40-22 = ? Check it with addition
18
18 + 22 = 40
A baker made 25 cookies in the morning and 35 in afternoon. How many in total?
60
What happens when the sum in the ones place is more than 9?
we carry over to the next column
If Sarah has 18 pencils and gives 7 to her friend, how many pencils does she have left?
48-27
40-20 = 20
8-7 = 1
20 + 1= 21
21
20-9= 10 True or false? Check by adding, if false give me real answer
9 + 10 = 19 not 20
false
20 - 9 = 11
9 + 11 = 20