Big numbers, groups and arrays
Answers are for parents and teachers.
1
Find an array at home or outside, such as an egg tray, tiles or windows. Write the number of rows, the number in each row and the total.
Any real array, with the total found by repeated addition and checked by counting.
2
Write 205,830 in expanded form.
200,000 + 5,000 + 800 + 30.
3
Put these in order from the greatest to the least: 36,004; 360,040; 36,400; 306,040.
360,040; 306,040; 36,400; 36,004.
4
A shop puts 9 pencils in each of 4 boxes. Skip count to find how many pencils there are.
9, 18, 27, 36. There are 36 pencils.
5
Write a repeated addition for this array and find the total.
4 + 4 + 4 + 4 = 16, from 4 rows of 4.