Question

Start with the equation 4·0=0 to explain why 4·−10 must equal −40 . Drag descriptions and equations to the table to complete the explanation.

Answer 1

Step 1 Given. 4·0=0

Step 2 Substitute. Any number plus its opposite is zero. 4(10+-10)=0

Step 3 Use the distributive property. 4·10+4·-10=0

Step 4 Multiply. 40+4·-10=0

Step 5 Subtract 40 from both sides. 4·-10=0-40

Step 5 Simplify to solve for 4·-10. 4·-10=-40