Robot Inspector: Check the Equal Sign

Help a robot decide if both sides of each equation are the same amount.

Equal means the same

Nia built a robot named Bolt. Bolt checks equations. Help Bolt learn what the equal sign means.

What does the equal sign = mean?

A. The answer comes next.B. Both sides are the same amount.C. Add the numbers together.

Which equation is true?

A. 5 + 2 = 8B. 7 − 1 = 5C. 9 = 6 + 3

Write true or false.

8 = 8 is .

Write true or false.

5 + 1 = 4 + 3 is .

Stamp true or false

Find the amount on each side of the equal sign. Are the two sides the same?

Help Bolt sort the equations.

Bolt stamped all of these TRUE. Circle only the ones that really are true.

Which equation is false?

A. 13 = 10 + 3B. 7 + 4 = 5 + 6C. 14 − 4 = 9 + 2D. 6 + 6 = 12

Check 9 + 3 = 8 + 4 one side at a time. Then write true or false.

Left side: 9 + 3 =
Right side: 8 + 4 =
The equation is .

Check 15 − 5 = 6 + 3 one side at a time. Then write true or false.

Left side: 15 − 5 =
Right side: 6 + 3 =
The equation is .

Help Bolt think

Bolt makes some mistakes. Help Bolt understand the equal sign.

10.

Bolt says 4 + 4 = 8 + 4 is true because 4 + 4 is 8. What mistake did Bolt make?

A. Bolt added 4 + 4 wrong. It is not 8.B. Bolt thought the equal sign means subtract.C. Bolt did not look at the whole right side. 8 + 4 is 12, not 8.

11.

Bolt says 9 = 9 is false because there is no plus sign or minus sign. Is Bolt right? Explain.

12.

Write your own true equation that has a plus sign on both sides of the equal sign. Tell how you know it is true.