Lesson 7 Add and Subtract Within 1,000

- Let’s add and subtract within 1,000.

Warm-up Which One Doesn’t Belong: Add and Subtract Within 100

Which one doesn’t belong?

$74 - 23$
$24 + 37$
$4$ tens + $2$ ones + $3$ tens + $7$ ones
$60 + 19$

Activity 1 Which Would You Rather Find?

$102 + 341$

$64 + 37$

$385 - 124$

$302 - 198$

$611 - 45$

$73 - 27$

$87 + 38$

$685 + 279$

$571 - 268$

$320 + 509$

$885 - 142$

$53 + 52$

Circle 2 sums or differences you think would be the most challenging to find. Find the value of one of these expressions. Show your thinking.
Choose 2 other expressions and find the values. Show your thinking.

Activity 2 Add and Subtract Within 100

Find the value of each expression.
$31 + 25 =$
$43 + 28 =$
$89 - 22 =$
$40 - 28 =$
$15 + 72 =$
$85 - 37 =$
$95 - 81 =$
$37 + 55 =$
$25 + 25 =$
$63 - 19 =$
$72 - 68 =$
$21 + 59 =$
Choose one value that you think was less challenging to find. Explain.
Choose one value that you think was more challenging to find. Explain.