Make a 10 or 100 to subtract mentally.
364 - 99 =
265
Estimate. Round each number to the indicated place value.
hundreds; 843 - 392 =
800 - 400 = 400
287 - 113 =
174
Determine whether and exact answer or an estimate is needed.
Marci wants to find out about how many more visitors came to the aquarium last month than this month.
Estimate.
Ahhh... Refreshing!
Make a 10 or 100 to subtract mentally.
1,980 - 528
1,452
Estimate. Round each number to the indicated place value.
tens; 575 - 54 =
580 - 50 = 530
600 - 452 =
148
Determine whether an exact answer or an estimate is needed.
George is trying to figure out how much money he would have left in his savings after he buys a new lego set.
Exact
Stand up. Do 5 jumping jacks.
Sit down. Energized!
Subtract mentally by breaking apart the smaller number.
100 - 87
100 - 80 = 20
20 - 7 = 13
13
Estimate. Round each number to the largest place value.
718 - 36 =
700 - 40 = 660
7,350 - 803 =
6,547
Nick wrote 993 pages of his new book on Monday. If he has completed a total of 2,040 pages by Tuesday, how many pages did he write on Tuesday?
2,040 - 993 = 1,047
Take 3 slow, deep breaths in through your nose, then out through your mouth.
Calming :)
Subtract mentally by breaking apart the smaller number.
98 - 24 =
98 - 20 = 78
78 - 4 = 74
74
Estimate. Round each number to the indicated place value.
tens; (193 - 34) - 17 =
(190 - 30) - 20 = ?
190 - 30 = 160
160 - 20 = 140
5,000 - 2,711 =
2,289
Miss Day spends $2,000 on new school supplies for her class. If the new stools she bought cost $423, how much did the other supplies cost?
$2,000 - $423 = $1,577
Stand up and do 5 toe touches.
Sit down. Energized!
Subtract mentally by breaking apart the smaller number.
673 - 13 =
673 - 10 = 663
663 - 3 = 660
660
Estimate. Round each number to the largest place value.
4,302 - 267 =
4,000 - 300 = 3,700
9,347 - 1,273 =
8,074
The Bad Guys are fighting an army of 7,610 zombie kittens! If they have defeated 3,058 zombie kittens so far, how many more do they need to defeat?
4,552 zombie kittens.
Yoga Pose! Follow Miss Elliott's instructions.
Stretch and relax.