Round 23,421 to the nearest thousand and ten thousand on a number line

nearest thousand: Look at the place value to the right of thousands, the hundreds place value. It is a 4. Because 4 is less than 5, round down.

nearest thousand: 23000

Nearest ten thousand: Look at the place value to the right of the ten thousands, which is the thousands place value. It is a 3. Because 3 is less than 5, round down

nearest ten-thousand: 20000

hope this helps

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.