Basic Mathematics

Basic Arithmetic

Evaluate $50-13 \times 3+20+7 \times 5.$

Evaluate $33 \div 11 \times 6 + 21 - 15 \div 5.$

Evaluate $-3 + 8 \div 5 \div 4 \times 10 + 7.$

What is the value of $4 \times 8 \div 4 \times 4 ?$

Evaluate $45+7 \times 3+5-7 \times 4.$