Question

build understanding
an ant walks 5 centimeters and stops. then it walks 4 centimeters. how far does the ant walk in all?
\underline{\\ 5\\ } \oplus \underline{\\ 4\\ } = \underline{\\ 9\\ }
\underline{\\ 9\\ } centimeters
a paper is 11 inches long. you cut off 3 inches. how long is the paper now?
\underline{\\ 11\\ } \circleddash \underline{\\ 3\\ } = \underline{\\ 8\\ }
\underline{\\ 8\\ } inches
try it

1. you swim 15 meters and take a break. then you swim 10 meters. how many meters do you swim in all?

\underline{\\ \\ \\ } \bigcirc \underline{\\ \\ \\ } = \underline{\\ \\ \\ } \quad \underline{\\ \\ \\ } meters

1. a ribbon is 16 yards long. you cut off 7 yards. how long is the ribbon now?

\underline{\\ \\ \\ } \bigcirc \underline{\\ \\ \\ } = \underline{\\ \\ \\ } \quad \underline{\\ \\ \\ } yards

Explanation:

1.

Step1: Identify operation (addition)

We need to find the total distance swum, so we add the two distances.
$15 + 10$

Step2: Calculate the sum

$15 + 10 = 25$

Step1: Identify operation (subtraction)

We need to find the remaining length of the ribbon, so we subtract the cut - off length from the original length.
$16 - 7$

Step2: Calculate the difference

$16 - 7 = 9$

Answer:

$15 + 10 = 25$; $25$ meters

2.