40+40

Here is a clear, step-by-step solution in English for a 3rd-grade student.

Problem: 40 + 40

Step 1: Recognize the operation

• This is addition: we are putting two numbers together.

Step 2: Use place value

• 40 is made of 4 tens (4 x 10).
• So 40 + 40 = (4 tens) + (4 tens).

Step 3: Add the tens

• 4 tens + 4 tens = 8 tens.

Step 4: Convert back to a number

• 8 tens equals 80.

Step 5: Check your answer

• 40 + 40 = 80. You can also think: 4 + 4 = 8, and keep the zero from the tens place, giving 80.

Final answer: 80

Quick tips:

• You can double the number: 40 + 40 is the same as 2 × 40 = 80.
• If you prefer, use a number line: start at 40 and jump 40 more to land on 80.