Grade 4 Mathematics Flashcards

A square has a side length of 7 inches. What is its perimeter?

Answer: 28 in

Perimeter of a square = 4 × side length = 4 × 7 = 28 inches.

What is 3/8 + 2/8?

Answer: 5/8

When fractions share the same denominator, add only the numerators: 3 + 2 = 5, keeping the denominator 8, giving 5/8.

Which of the following numbers is prime?

Answer: 17

17 is prime because its only factors are 1 and 17; the others (9=3×3, 15=3×5, 21=3×7) have additional factors.

What is 25 × 16?

Answer: 400

25 × 16 = 25 × 4 × 4 = 100 × 4 = 400.

Which expression shows the distributive property applied to 6 × (3 + 4)?

Answer: 6 × 3 + 6 × 4

The distributive property multiplies the outside factor by each addend separately: 6 × (3 + 4) = (6 × 3) + (6 × 4).

How many lines of symmetry does a rectangle (that is not a square) have?

Answer: 2

A non-square rectangle has exactly 2 lines of symmetry — one horizontal and one vertical through the midpoints of opposite sides.

A line plot shows values at 1/4, 1/4, 1/2, 3/4, 3/4, and 1. What is the sum of all data points?

Answer: 3 1/2

Converting to fourths: 1/4 + 1/4 + 2/4 + 3/4 + 3/4 + 4/4 = 14/4 = 3 2/4 = 3 1/2.