Applying rounding for estimating (subtracting)

Lesson details

Key learning points

1. In this lesson, we will build on our knowledge of the 10 times table in order to estimate by rounding. We will do this to answer subtraction questions.

Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

Video

Share with pupils

5 Questions

Q1.
Which of numbers does not need to be rounded to the nearest 10?
44
56
6
Q2.
What is 27 rounded to the nearest 10?
20
270
28
Q3.
What is 523 rounded to the nearest 10?
500
521
530
Q4.
Round to estimate this answer 102 + 45 =
12
140
400
Q5.
What is 1999 rounded to the nearest 10?
1000
190
200

5 Questions

Q1.
What is 554 rounded to the nearest 10?
50
500
560
Q2.
Does this look like a good estimate? 720 - 30 = 500
yes
Q3.
Does this look like a good estimate? 575 - 159 = 415
No
Q4.
What is an estimated answer here? 604 - 350 =
300
550
600
Q5.
What is this number rounded to the nearest 10? 996