Deriving decimal addition and subtraction facts

Deriving decimal addition and subtraction facts

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Lesson details

Key learning points

  1. In this lesson, we will add and subtract decimals using our known facts to help us.

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5 Questions

Q1.
True or false, when we multiply by 10, we add a 0?
Correct answer: False
True
Q2.
0.036 x 10 =
0.036
Correct answer: 0.36
3.6
36
Q3.
"If I divide 6.23 by 100, the answer will be less than 1"
False
Correct answer: True
Q4.
The relationship between 0.15 and 150 is...
Multiply and divide by 10
Multiply and divide by 100
Correct answer: Multiply and divide by 1000
Q5.
2.5 x _____ = 250
10
Correct answer: 100
1000

5 Questions

Q1.
Which known fact will help me answer 30 + 40 and 0.03 + 0.04?
13 + 4 = 17
3 x 4 = 12
4 - 3 = 1
Correct answer: 7 = 3 + 4
Q2.
0.6 + 0.3 = ____
0.009
0.09
Correct answer: 0.9
9
Q3.
If I know 4 + 5 = 9, then I know... (pick two)
Correct answer: 0.04 + 0.05 =
0.4 + 0.09 =
0.5 x 0.4 =
Correct answer: 0.9 - 0.4 =
Q4.
If I know 15 + 4 = 19, then I know... (pick two)
0.04 + 0.015 =
Correct answer: 0.15 + 0.04 =
0.15 + 0.4 =
Correct answer: 1.5 + 0.4 =
Q5.
What is 0.06 - 0.02?
0.004
Correct answer: 0.04
0.4
4

Lesson appears in

UnitMaths / Calculating with whole numbers and decimals