Arrays and estimating
Answers are for parents and teachers.
1
Draw an array with 3 rows and 5 columns. Write the sentence for the rows and the sentence for the columns.
Rows: 5 + 5 + 5 = 15. Columns: 3 + 3 + 3 + 3 + 3 = 15.
2
Find an array at home, such as an egg box. Write how many rows and columns it has and the total.
Any real array, for example 2 rows of 6 gives 12.
3
Round each number to the nearest ten: 14, 29, 55, 91.
10, 30, 60, 90.
4
Use front-end estimation: 63 + 24 and 82 + 15.
60 + 20 = 80 and 80 + 10 = 90.
5
Which ten is the dot closest to?
90, because the dot is at 87.