Your next great Lessn starts here.

Welcome to Subtraction! – Learn to take away with subtraction – Subtract numbers up to 18 – Understand subtracting smaller numbers from 18 or less – Solve fun subtraction word problems – Use stories to find out ‘how many are left’ – Practice makes perfect – Keep practicing with different problems | This slide introduces the concept of subtraction to second graders, focusing on numbers up to 18. Begin by explaining subtraction as ‘taking away’ one number from another. Use visual aids like counters or drawings to help students visualize the concept. Present word problems as stories to make the session interactive and engaging. For example, ‘If you have 15 apples and you give away 7, how many do you have left?’ Encourage students to use their fingers or objects to count and solve the problems. Reinforce the idea that practice is key to mastering subtraction, and provide a variety of problems for them to work on.

Understanding Subtraction – Subtraction means taking away – Like removing items from a group – It shows how many are left – If you start with a number, subtraction tells you what remains after taking some away – Example with apples – Start with 5 apples, eat 2, count what’s left – Practice with different numbers – Try subtracting with numbers up to 18 | This slide introduces the concept of subtraction to second graders. Subtraction is explained as the process of taking away from a total amount, which helps us figure out the remaining quantity. Use everyday examples, like eating apples, to make the concept relatable. Encourage students to visualize the action of removing items and counting what’s left. Provide various examples with numbers up to 18 to ensure they grasp the concept with different quantities. During the class, engage students with hands-on activities where they can physically remove items and count the leftovers to reinforce the concept of subtraction.

Subtraction Keywords: Clues in Word Problems – Words that signal subtraction – ‘Less’, ‘minus’, ‘fewer’, ‘take away’ – Clues for subtracting in problems – These words in a story mean we need to subtract – Practice finding these keywords – Let’s try to spot these words in examples! | This slide introduces students to the concept of subtraction keywords, which are terms that indicate a subtraction operation is needed to solve a word problem. The words ‘less’, ‘minus’, ‘fewer’, and ‘take away’ are common indicators that subtraction is the required method. It’s crucial to help students recognize these terms within the context of a sentence or story problem. During the lesson, provide several examples of word problems and guide students to identify the keywords that signal subtraction. Encourage them to underline or highlight these words in the problems. After the presentation, engage the class in an activity where they find and solve subtraction problems from a worksheet or a book, focusing on using these keywords as clues.

Subtraction Word Problems: Birds on a Tree – Start with 10 birds on a tree – 3 birds fly away – How many birds are left? – Use fingers or drawings to subtract 3 from 10 – Let’s count down together! – Counting backwards from 10 to find the answer | This slide introduces a simple subtraction word problem involving birds on a tree. It’s designed to help second graders visualize the subtraction process. Begin by explaining the scenario with 10 birds and then describe 3 flying away. Ask the students to visualize or draw the birds on the tree and then erase or cross out 3 to find out how many are left. Encourage them to use their fingers to count down from 10 to 7, reinforcing the concept of subtraction by counting backwards. This interactive approach helps solidify their understanding of subtraction within 18. In the next class, students can share similar word problems they’ve created or solved at home.

Subtraction Word Problem: Balloon Count – Sam’s balloon count: 15 – Balloons flew away: 7 – How to subtract: 15 – 7 – Start with 15, then count back 7 steps – Find the answer – Use fingers or drawings to subtract | This slide presents a subtraction word problem involving balloons to make the concept relatable for second graders. Begin by reading the problem aloud and ensure students understand the scenario. Explain that we are starting with 15 balloons and 7 fly away, so we need to subtract 7 from 15. Encourage students to use their fingers or draw pictures to represent the balloons and visually count how many are left after 7 fly away. This tactile or visual approach helps solidify the concept of subtraction. After solving, discuss the answer as a class and reinforce the subtraction process. For homework, ask students to create their own subtraction word problems with solutions.

Let’s Practice More Subtraction! – Solve problems as a group – Look for subtraction keywords – Words like ‘less’, ‘fewer’, and ‘minus’ signal subtraction – It’s okay to ask questions – If a problem is confusing, raise your hand for help – Practice makes perfect | This slide is designed to encourage active participation and reinforce the concept of subtraction through group problem-solving. Emphasize the importance of recognizing keywords that indicate subtraction, such as ‘less’, ‘fewer’, ‘take away’, and ‘minus’. Remind students that it’s completely fine to ask questions if they encounter any difficulties. Use a variety of word problems that involve subtracting numbers up to 18 to cater to different skill levels. Encourage students to verbalize their thought process as they solve each problem. This will help them understand the concept better and gain confidence in their subtraction skills. Provide positive feedback and guidance as needed.

Subtraction Game Time! – Play a subtraction dice game – Roll dice twice for numbers – Subtract: smaller from bigger – If you roll a 6 and a 4, subtract 4 from 6 – Record your answers – Write down each result to keep track | This interactive game is designed to help second graders practice subtraction in a fun and engaging way. Provide each student with a pair of dice and a worksheet to record their answers. Explain that they will roll the dice twice to get two numbers. They must identify the smaller number and subtract it from the bigger number. This activity will reinforce the concept of subtraction and help them visualize the process. Encourage students to check their work by adding the difference to the smaller number to see if it equals the bigger number. Offer several rounds of play to ensure students get ample practice, and consider pairing students to promote teamwork.

Class Activity: Subtraction Skit – Form small groups for skit – Create a subtraction story – Think of a scenario where you might give away or lose items – Use props to show subtraction – Items like blocks or toys can help visualize taking away – Present your skit to the class | This interactive class activity is designed to help students understand subtraction through a creative and engaging method. Divide the class into small groups and assign them to create a short skit that involves a subtraction scenario. Encourage them to use classroom objects as props to act out the process of subtracting items, which will help them visualize the concept. For example, one student could ‘give away’ a certain number of blocks to another, and they would then count how many are left. Each group will then present their skit to the class, allowing for peer learning. As a teacher, be prepared to offer guidance and ensure each group understands the subtraction concept. Possible scenarios could include a birthday party where a certain number of guests leave, or a picnic where some food items are eaten. The goal is for students to see subtraction in action and relate it to real-life situations.

Subtraction Review and Homework – Review subtraction concepts – Solve 5 workbook problems – Find and solve 5 problems involving subtraction up to 18 – Practice subtraction at home – Try subtracting with family for fun practice – Share your answers in class | This slide is aimed at reinforcing the subtraction skills learned in class. Students should review the concept of subtraction, ensuring they understand how to subtract one-digit numbers up to 18. For homework, they are assigned to solve 5 specific subtraction word problems from their workbook, which will help solidify their understanding. Encourage students to involve their family in their practice by subtracting during everyday activities, such as playing games that involve counting. Remind students to bring their answers to the next class for discussion. This will not only help them remember the concept but also allow them to demonstrate their knowledge and share their learning experience.