120 mental arithmetic questions in Volume 1 of grade 4 Please give me 120 mental arithmetic questions. I will do them before February 15!

120 mental arithmetic questions in Volume 1 of grade 4 Please give me 120 mental arithmetic questions. I will do them before February 15!

200×30= 42×4= 63-7= 230×20= 130×3= 60×50= 150÷3= 260×2= 75-26= 21×40= 35×20= 15×80= 300×6= 15×8= 23×30= 51÷3= 60÷60= 80÷5= 240÷80= 100÷50= 1200÷20= 250÷50= ...