Arrays
Write two repeated addition sentence to show the array
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
4 + 4 + 4 + 4 + 4
5 + 5 + 5 + 5
Even numbers have
partners
pairs
nothing left over
6 + 8 =
14
17 - 5 =
12
___ + 5 = 7 + 2
4
How many columns and rows are in this array? Label your numbers
X X X X
X X X X
2 rows
4 columns
Odd numbers will
have one left without a partner or pair
54 + 23 =
77
45 - 33 =
12
12 - 10 = 15 - ___
13
What is the total number of objects in this array?
@ @ @ @ @ @ @
@ @ @ @ @ @ @
@ @ @ @ @ @ @
7 x 3 = 21
7 + 7 + 7 = 21
3 + 3 + 3 + 3 + 3 + 3 + 3 = 21
Is 38 Even or Odd?
even
21 + 34 + 45 =
100
True or False we have to regroup in the problem below
45 - 17 =
True
45 - 15 = 30
label each number with the correct name
45 minuend
15 subtrahend
30 difference
Draw an array and write two repeated addition sentences to go with the array.
Answers will vary. Teacher must check the array
Is 15 Even or Odd
Odd
True or False: When adding 2-digit numbers we model/draw both addeneds.
True
What is the first step you should take when solving a subtraction problem?
write it vertical
67 -34 = 76 - ___
Missing Subtrahend = 33
* * * * *
* * * * *
* * * * *
* * * * *
Make a T chart and put EVEN on one side and ODD on the other; pick any two-digit number to make this true.
Even = anything ending in 2, 4, 6, 8
Odd = anything ending 1, 3 5, 7, 9
45 + 34 + 22
101
100 - 56 =
44
___ - 37 = 46 - 20
Missing minuend = 63