Mental Math
Grade 4
Grade 4
What do I need to add to 0.83 to make 2?
What is the value of x times 2 divided by 6 if x is 21?
7
413 ÷ 7
53.1 – 64.9
4,119 – 1,222
2,607.3 – 3,186.7
A school bus has three rows of seats with 24 seats in each row. About how many seats are there on the bus?
75 seats
List two multiples of 6 between 35 and 45
36 and 42
the perimeter of a square is 400 cm. What would the area of this square be?
1,000
93.6 – 38.98
49.158 – 60.082
39.9 + 9.87
44.793 – 54.747
There are 45 students in a class. If two-thirds of them bring their lunch, estimate how many students bring their lunch.
Round 45 to 50 and estimate two-thirds of 50 by calculating 50 x 2/3 ≈ 33. So, approximately 33 students bring their lunch.
120 divide by 3 multiply by 11
440
what is 3/8 of 320
120
31 x 58
1,618.2 – 1,977.8
557 ÷ 79
6.345 – 7.755
A bookstore has seven shelves filled with books. Each shelf has approximately 95 books. Estimate the total number of books in the bookstore.
700 books
if 4 times n is 72, what is the value of n?
18
how many groups of 9 are in 9,054
1,006
798 - 213
526.5 - 643.5
698 + 719
1,275.3 – 1.558.7
A neighborhood has 120 houses. If about half of them have a pet dog, estimate the number of houses with a pet dog
60 houses
what is the sum of 6 1/2, 2, and 1 3/4
10 1/4
What is the product of 3/6 and 1/10
1/20
3 4/5 + 10 1/3 + 5 5/6
17.973 – 21.967
399 x 77
2,513.7 – 3,072.3
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