Mental Math
Grade 4
Grade 4
What do I need to add to 0.83 to make 2?
1.17
What is the value of x times 2 divided by 6 if x is 21?
7
413 ÷ 7
59
4,119 – 1,222
2,897
A school bus has three rows of seats with 24 seats in each row. How many seats are there on the bus?
72 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 cm2
BONUS POINT: how would you convert this area from cm2 to m2?
93.6 – 38.98
54.62
39.9 + 9.87
49.77
There are 45 students in a class. If two-thirds of them bring their lunch, how many students bring their lunch?
33 students bring their lunch.
Find 120 divided by 3 multiplied by 11
440
what is 3/8 of 320
120
31 x 58
1798
Approximate 557 ÷ 79 to the nearest integer.
7
A bookstore has seven shelves filled with books. Each shelf has approximately 95 books. Estimate the total number of books in the bookstore.
665 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) / 3
195
698 + 719
1,417
A neighborhood has 120 houses. If half of them have a pet dog, one quarter of them have a pet cat, and the rest have no pet, find the number of houses with no pet.
30 houses
what is the sum of 6 1/2, 2, and 1 3/4
10 1/4 (or 10.25)
What is the product of 3/6 and 1/10
1/20 (or 0.05)
Approximate (3 4/5 + 10 1/3 + 5 5/6) to the nearest integer.
20
399 x 77
30,723
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YES!