Teacher'S Letter - Starting Unit 5
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1
2Dear Family,
My class is starting Unit 5. I will be learning about subtracting
two-digit numbers with and without regrouping. These pages
show some of what I will learn and have activities for us to do
together.
From, _______________________
These are some words I will use in this unit.
difference
The answer to a subtraction problem
estimate
An estimate is an answer that is
close to an exact answer.
15
15 – 10 = 5
– 10
round to
29
30
difference
nearest ten
5
– 21
round to
– 20
nearest ten
10
estimate
round
regroup
To find which number another
In subtraction, to trade 1 ten for 10 ones
number is closer to
(This used to be called “borrowing.”)
1
= 10
ten
ones
54
50
60
is closer to
than
.
54
50
Round down.
rounds to
.
50
51 52 53
54
55 56 57 58 59
60
Let’s work together to complete these sentences.
1.
15 – 8 = 7
7
In
, the number
is the
.
2.
1
Sometimes when you subtract you need to
ten as
10
ones.
Unit 5
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