Grade 1 Math Flashcards and Task Cards: Subtraction within 100

How to Present

• Use the word cards to pre-teach and review the subtraction words (2 per A4 page — print and cut). Use the 16 task cards for Scoot or group work; children write answers on the recording sheet, and the answer key is on the same page.

Games & Speaking Activities

• Word wall: put the word cards next to the Subtraction Helper poster for the whole unit.
• Scoot: put the task cards around the room; children move every minute and write their answers.

Teacher Tips

The most common mistake in this unit is taking ones away from the tens: 56 − 3 = 26 instead of 53. Before every take-away, ask "Is it tens or ones?" and let children build the number with blocks or bundles of 10 straws and really take the blocks away. Teach one sentence and use it all week: "We take away ones, so the tens stay the same." Keep the hundred chart on the desk for the whole unit: up 1 row is take away 10, left 1 is take away 1. Every question in this pack has enough ones, so children never need to break a ten. If a child asks about 52 − 7, praise the question and say it is the next step (Grade 2 regrouping).

Learning Objectives

• Say how many tens and ones are in a number to 100.
• Take away whole tens (70 − 30 = 40) with blocks, the hundred chart and a number line.
• Take away ones from a two-digit number and keep the tens the same (47 − 5 = 42).
• Count back by ones and by tens on a number line and the hundred chart.
• Subtract a two-digit number with no regrouping: tens first, then ones (58 − 23 = 35).
• Solve take-away and "how many more?" word problems and find missing numbers.
• Check a subtraction by adding (35 + 23 = 58).

Differentiation

Support: Let children build every number with base-ten blocks, bundles of 10 straws or the paper blocks and really take them away. Start with numbers under 50 and with tens-only questions. Keep the hundred chart and the Subtraction Helper poster on the desk. Give sentence frames ("___ tens take away ___ tens is ___ tens." "___ are left."). Pair a child who is new to English with a partner who models the sentences.
Extension: Write 3 subtraction sentences with the answer 20 (the worksheet Challenge), make up a story for 68 − 25, find all the ways to take a number from 50 and leave 30, and check every answer by adding. Fast finishers can play Take Away Challenge (Number Line or Story Problems mode).

Assessment

Check the recording sheets with the answer key: cards 1–4 take away with blocks, 5–7 number lines and the hundred chart, 8–11 subtract, 12 missing number, 13–15 word problems and 16 check by adding.

What's Included

• 12 A5 word cards with pictures (6 pages)
• 16 task cards (2 pages)
• Recording sheet with answer key (1 page)
• DOCX + PDF

Additional Files

• Grade 1 Math Flashcards and Task Cards: Subtraction within 100 (DOCX)

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