Mental Math
80 − 30 = ?
50
846 − 215 = ?
631
500 − ___ = 300
200
A store had 80 pencils and sold 25. How many remain?
55 pencils
What is the value of 7 in 7,438?
7,000
93 − 28 = ?
65
752 − 368 = ?
384
740 − ___ = 415
325
3A collected 435 cans, and 3B collected 278. How many more did 3A collect?
157 more cans
Find the missing number: 325, 425, 525, ___, 725
625
600 − 250 = ?
350
3,914 − 1,725 = ?
2,189
3,914 − 1,?25 = 2,189. Find ?
7
Draw a comparison bar model: Sara has 1,642 beads and Ali has 1,145. What is the difference?
497 beads
A school collected 1,475 books Monday and 2,685 Tuesday. It donated 1,250 books. How many remain?
2,910 books
1,000 − 475 = ?
525
6,000 − 2,758 = ?
3,242
___ − 1,650 = 2,350
4,000
A baker had 5,000 grams of flour and used 3,995 grams. How much remains?
1,005 grams
Order from least to greatest: 6,205; 6,520; 6,052.
6,052; 6,205; 6,520
4,200 − 1,980 = ?
2,220
9,563 − 7,128 = ?
2,435
A student says 3,500 − 2,847 = 6,347. Explain the mistake and correct it.
They added digits without regrouping; 653
Lina has $2,560. She has $600 more than Omar. Maya has $1,050 less than Omar. How much does Maya have?
Omar: $1,960; Maya: $910
Round 8,649 to the nearest ten AND nearest thousand.
8,650 and 9,000