Divide and Conquer
63 ÷ 9 =
7
Mrs. Chung had 14 vases. Each vase had 6 roses. How many roses are there altogether?
84 roses
14 x 6=84
Estimate 36 x 42
160
36 x 42=
40 x 40 = 160
What's the rule?
Input Output
3 12
4 16
5 20
6 24
x 4
65 ÷ 5
13
15 students
135 ÷ 9
Estimate: 78 x 91
720
78 x 91
80 x 90=720
1, 2, 4, 8, 16...what's the next number?
32
47 ÷ 4
11 R 3
Sofia was reading a book that had 1,053 pages. On Monday, she read 287 pages. On Tuesday, she read 365 pages. How many more pages does she have to read until she finishes the book?
348 pages
Add 287 + 365= 652
Subtract 1,053-652=348
Estimate: 11 ÷ 5
2
11 ÷ 5
10 ÷ 5=2
1, 2, 4, 7, 11,...what's the next number?
16
494 ÷ 8=
61 R 6
Zaddiya and her friends are going to the trampoline park for her birthday. There are 9 kids and 4 adults going. They want to take as few cars as possible. If each car can hold a total of 5 people, how many cars will they need to take? (Hint: how is the remainder used here? Do we need a car for them also?)
3 cars
Here the remainder is used to add 1 to the quotient (equal groups)
Estimate: 321 ÷ 8
40
321 ÷ 8
320 ÷ 8=40
37, 31, 25, 19, ___, ____, ____,
What are the next three numbers?
13, 7, 1
378 ÷ 3=
126
There are 127 marbles in a bucket. The marbles need to be split between 8 groups of students. How many marbles will be left over after being split equally between the groups?
7 marbles left over
Remainder is used as the answer
Estimate: 291 ÷ 5
58 or 60
291 ÷ 5
290 ÷ 5=58
300÷ 5= 60
What's the missing number in this table?
Input Output
36 9
32 8
24 6
___ 4
16