Unknowns
3 X N=15
N=5
2 + ( 3 X 7 ) =
= 23
30 X 7 =
= 210
What rule is used in the pattern below?
68, 61, 54, 47, 40, 33 . . . .
= Subtract 7
Sarah counted her crayons and found out that she has 80 crayons in her crayon boxes. Every crayon box can contain 8 crayons. How many crayon boxes does she need?
= 80 crayons ÷ 8 crayons per box = ? Boxes
= 10 Boxes of Crayons
50 ÷ A = 5
A =10
2 X (5 + 3) =
= 16
50 X 8 =
= 400
What rule is used in the pattern below?
6, 12, 18, 24, 30 . . . .
= Add 6
There are 67 birds living near the mountain. If 32 birds flew away for winter, how many birds were left near the mountain?
= 67 birds - 32 flew away
= 35 birds left near the mountain
F X 6 = 54
F = 9
6 x (13 - 3) =
= 60
90 X 2 =
= 180
What rule is used in the pattern below?
6, 12, 24, 48, 96, 192 . . . .
Andrew’s 4 friends decided to bring food. If each of them brought 4 slices of pizza and 3 bags of chips, how many slices of pizza do they have in total?
= 4 friends X 4 slices per friend
= 16
72 ÷ H = 8
H = 9
30 ÷ (5 + 5) =
= 3
70 X 6 =
= 420
What rule is used in the pattern below?
486, 162, 54, 18, 6, 2 . . . .
= Divided by 3
Lexie’s younger brother helped pick up all the paper clips in Lexie’s room. He was able to collect 81 paper clips. If he wants to put the paper clips in 9 boxes, how many paper clips would go in each box?
= 81 paper clips ÷ 9 boxes = ? how many per box
= 9 per box
7 X B = 56
B = 8
(4 X 6) - 12 =
= 12
60 X 9 =
= 540
What rule is used in the pattern below?
62, 53, 44, 35, 26, 17 . . . .
= Subtract 9
In order to start constructing the house, Charlie and his father needed to gather some wood from the forest. If they start with 15 planks of wood in the house and Charlie and his father got 10 planks of wood each, how many pieces of wood do they have in total?
= 15 + 10 + 10
= 35