4th Grade Math Unit1.2 Writing Whole Numbers in Expanded Form (One Term per Column)

Today's lesson is expanded form, laying the worth row of the place-value table out flat as a sum with a term for every column. 45,732 opens to 40,000 + 5,000 + 700 + 30 + 2, and those terms add straight back to the number 7,453 has four columns, so it opens to four terms: 7,000 + 400 + 50 + 3 A digit of zero gets no term, so 6,208 is 6,000 + 200 + 8 and 4,035 skips its hundreds 40,600 has five digits but a line of only two terms, 40,000 + 600, and a short line is not a mistake The terms are worths, not digits, so 8 + 1 + 6 + 4 is not the expanded form of 8,164 Read the other way, the line 4,000 + 300 + 50 + 6 asks which number it adds back to Pupils finish able to write a whole number within 100,000 as a sum of column worths and to recover the number a given sum adds to. CHAPTERS 0:00 One number, written open 1:03 The worth row becomes a sum 3:07 Four digits, four terms 4:34 The zeros get no term 6:05 Question 1 - which line is 8,164? 6:47 Question 2 - which number is this line? 7:34 Question 3 - the real line for 4,035 8:14 Question 4 - the line for 40,600 8:51 Question 5 - what is the 7 worth? 10:02 What we learned today