Mental Math
457-100
357
324-112
212
456-123
333
Olivia had 350 shells. She gave 120 to a friend. How many shells does she have left?
230 shells
725-321
404
542-200
342
456-231
225
582-147
435
A farmer picked 735 pumpkins. He sold 278 pumpkins. How many pumpkins does he have left?
457 pumpkins
Using place value blocks, solve 634-287
347
623-300
323
532-248
284
Count up on the open number line to find: 704-268
436
Lily wants to read 400 pages this month. She reads 175 pages in the first week and 132 pages in the second week. How many more pages does Lily need to read?
Lily still needs to read 93 more pages.
Solve 812-479 using an open number line.
333
789-120
669
671-356
315
Count up on the open number line to find: 853-379
474
Anthony wants to collect 500 stamps this year. He collects 215 stamps in the first month and 138 stamps in the second month. How many more stamps does Anthony need to collect?
147 stamps
Solve using an open number line or place value blocks: 752-486
266
945-545
400
804-278
526
Count up on the open number line to find: 931-486
445
Emma wants to run 300 miles this summer. She runs 120 miles in June and 95 miles in July. How many more miles does she need to run?
85 miles
Maria wants to read 500 pages this month. She reads 187 pages in the first week, 143 pages in the second week, and 92 pages in the third week. How many pages does she still need to read?
78 pages