Year 5
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Lesson details
Key learning points
- In this lesson, we will learn to estimate using derived facts and then adjust them to calculate the answer. We will then be able to solve a range of problems selecting suitable strategies and giving reasons for our choices.
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.
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5 Questions
Q1.
Which of the following methods for answering a multiplication questions is NOT a mental strategy?
Array models
Blank number line
Marked number line
Q2.
Today we discussed distributive law in relation to multiplication. But which of the following number sentences does NOT correctly represent distributive law?
13 x 24 = 10 x 24 + 3 x 24
19 x 17 = 19 x 10 + 19 x 5 + 19 x 2
32 x 7 = 30 x 7 + 2 x 7
Q3.
Which of the following representations would be efficient for the calculation 317 x 23?
Cuisenaire Rods
Dienes
Q4.
For which of these calculations would you consider using a mental strategy and NOT a written method?
456 x 7
572 x 6
923 x 6
Q5.
Which calculation do the dienes represent?
16 x 6
603 x 6
63 x 6
4 Questions
Q1.
Which of the following number sentences would be the most efficient choice to use when estimating 237 x 4
200 x 4
230 x 4
235 x 4
Q2.
Which estimation is correct for the calculation 192 ÷ 8?
190 ÷ 8
192 ÷ 10
200 ÷ 10
Q3.
I rounded a calculation and got the estimated answer of 560. But what was my original sum?
109 x 4
131 x 4
152 x 4
Q4.
Which of the following calculations would provide you with the value indicated on the marked number line after it is rounded to create an estimated answer?
104 x 7
197 x 4
72 x 11