Page 40 - PlayFacto_S1
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The order of operations
1. Solve an equation in parentheses first.
2. When there are no parentheses, multiply and divide from left to right.
3. Then, add and subtract from left to right.
( 4 + 7 ) 6 =66 18 (2 3) =3
11 6
66 3
Example 1 Complete each number sentence as shown below.
1000 – (450 + 300) = 250
750
250
⑴ (4 + 3) 5 = ⑵ (7 – 4) 6 =
⑶ 14 (7 – 5) = ⑷ (20 – 2) 9 =
4. Mixed calculation 2 37
1. Solve an equation in parentheses first.
2. When there are no parentheses, multiply and divide from left to right.
3. Then, add and subtract from left to right.
( 4 + 7 ) 6 =66 18 (2 3) =3
11 6
66 3
Example 1 Complete each number sentence as shown below.
1000 – (450 + 300) = 250
750
250
⑴ (4 + 3) 5 = ⑵ (7 – 4) 6 =
⑶ 14 (7 – 5) = ⑷ (20 – 2) 9 =
4. Mixed calculation 2 37
