Mathematics, 02.03.2021 06:30 meliac
Describe two different ways that you could find the product 4 × 998 using mental math. Find the product and complete the explanation of why your model works.
(1) Think of 998 as 1,000 − 2. So, 4 ×
= 4(1,000 − 2). By the
(select)
Property, 4(1,000 − 2) = 4,000 − 8 =
.
(2) Think of 998 as 900 + 90 +
. By the
(select)
Property, 4(900 + 90 + 8) = 3,600 + 360 +
=
Answers: 2
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