Deriving decimal addition and subtraction facts

Deriving decimal addition and subtraction facts

Lesson details

Key learning points

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

Licence

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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