Math Vocabulary
A number close to an exact amount or to find about how many or how much.
Estimate
817 x 6
4,902.
81/9
9
72/4
18.
Estimate: 47 x 61
(50 x 60) = 3,000
Finding the nearest ten, hundred, thousand, or some other place value. The usual rule is to go up if the next digit to the right is 5 or more and go down if the next digit to the right is less than 5.
Rounding
45 x 62
2,790.
8
68/5
13 r.3
Estimate: 123/3
120/3 = 40
Which number sentence shows an array?
A. 3 + 4
B. 3 × 4
C. 34 − 4
D. 34 ÷ 4
3 x 4
23 x 51
1,173.
You have 72 trading cards. You give 6 cards to each friend and keep 12 for yourself. How many friends got cards?
10
874/6
145 r.4
Estimate: 891 x 7
900 x 7 = 6,300
A remainder happens when:
A. numbers divide evenly
B. something is left over after dividing
C. you add too much
D. you subtract twice
B. something is left over after dividing
45,817 x 9
412,353
Ben read 64 pages in 4 days. Each chapter has 8 pages. How many chapters did he read in total?
8
1,245/4
311 r.1
Estimate: 718/9
720/9 = 80
The answers to these problems have different names. Name them.
1. Addition problems
2. Subtraction Problems
3. Multiplication Problems
4. Division Problems
1. Sum
2. Difference
3. Product
4. Quotient
1974 x 823
1,624,602
There are 144 students in a school with 12 classrooms. Each classroom has 12 desks. How many students sit at each desk group of 12?
12
9,648/8
1,206.
Estimate: 42 x 49
40 x 50 = 2,000